// This javascript was written at SRI and it incorporates code that was built by
// SUN (see copyright below). The file contains three javascript functions that you 
// can use to output an HTML tag for a java applet that will run on both Mac and 
// Windows machines using either Netscape 4.0 (or higher), Internet 
// Explorer 4.x (or higher), or iCab browsers. The tag output is broken up into 3 
// parts in order to allow you to specify applet parameters, which require different 
// formatting for the different HTML tags. See the individual function headers for 
// detailed instructions.
//
// This file is specifically for ESCOT applets. There are several URLs embedded in this 
// code that will appear in the HTML output if there is something wrong with the users's
// browser or java setup. Make sure to include those references, or to modify them, 
// when copying this file.

 
// Ultimate client-side JavaScript client sniff.
// (C) Netscape Communications 1999.  Permission granted to reuse and distribute.
// Revised 20 April 98 to add is_nav5up and is_ie5up (see below).

// Everything you always wanted to know about your JavaScript client
// but were afraid to ask. Creates "is_" variables indicating:
// (1) browser vendor:
//     is_nav, is_ie, is_opera
// (2) browser version number:
//     is_major (integer indicating major version number: 2, 3, 4 ...)
//     is_minor (float   indicating full  version number: 2.02, 3.01, 4.04 ...)
// (3) browser vendor AND major version number
//     is_nav2, is_nav3, is_nav4, is_nav4up, is_nav5, is_nav5up, is_ie3, is_ie4, is_ie4up
// (4) JavaScript version number:
//     is_js (float indicating full JavaScript version number: 1, 1.1, 1.2 ...)
// (5) OS platform and version:
//     is_win, is_win16, is_win32, is_win31, is_win95, is_winnt, is_win98
//     is_os2
//     is_mac, is_mac68k, is_macppc
//     is_unix
//        is_sun, is_sun4, is_sun5, is_suni86
//        is_irix, is_irix5, is_irix6
//        is_hpux, is_hpux9, is_hpux10
//        is_aix, is_aix1, is_aix2, is_aix3, is_aix4
//        is_linux, is_sco, is_unixware, is_mpras, is_reliant
//        is_dec, is_sinix, is_freebsd, is_bsd
//     is_vms
//
// See http://www.it97.de/JavaScript/JS_tutorial/bstat/navobj.html and
// http://www.it97.de/JavaScript/JS_tutorial/bstat/Browseraol.html
// for detailed lists of userAgent strings.

//
// Note: you don't want your Nav4 or IE4 code to "turn off" or
// stop working when Nav5 and IE5 (or later) are released, so
// in conditional code forks, use is_nav4up ("Nav4 or greater")
// and is_ie4up ("IE4 or greater") instead of is_nav4 or is_ie4
// to check version in code which you want to work on future
// versions.

    // convert all characters to lowercase to simplify testing
    var agt=navigator.userAgent.toLowerCase();

    // *** BROWSER VERSION ***
    // Note: On IE5, these return 4, so use is.ie5up to detect IE5.
    var is_major = parseInt(navigator.appVersion);
    var is_minor = parseFloat(navigator.appVersion);

    var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
                && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
                && (agt.indexOf('webtv')==-1));
    var is_nav2 = (is_nav && (is_major == 2));
    var is_nav3 = (is_nav && (is_major == 3));
    var is_nav4 = (is_nav && (is_major == 4));
    var is_nav4up = (is_nav && (is_major >= 4));
    var is_navonly      = (is_nav && ((agt.indexOf(";nav") != -1) ||
                          (agt.indexOf("; nav") != -1)) );
    var is_nav5 = (is_nav && (is_major == 5));
    var is_nav5up = (is_nav && (is_major >= 5));
    
    var is_iCab = (agt.indexOf("icab") != -1);

    var is_ie   = (agt.indexOf("msie") != -1);
    var is_ie3  = (is_ie && (is_major < 4));
    var is_ie4  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")==-1) );
    var is_ie4up  = (is_ie  && (is_major >= 4));
    var is_ie5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
    var is_ie5up  = (is_ie  && !is_ie3 && !is_ie4);

    var is_aol   = (agt.indexOf("aol") != -1);
    var is_aol3  = (is_aol && is_ie3);
    var is_aol4  = (is_aol && is_ie4);

    var is_opera = (agt.indexOf("opera") != -1);
    var is_webtv = (agt.indexOf("webtv") != -1);

    // *** JAVASCRIPT VERSION CHECK ***
    // Useful to workaround Nav3 bug in which Nav3
    // loads <SCRIPT LANGUAGE="JavaScript1.2">.
    var is_js;
    if (is_nav2 || is_ie3) is_js = 1.0
    else if (is_nav3 || is_opera) is_js = 1.1
    else if ((is_nav4 && (is_minor <= 4.05)) || is_ie4) is_js = 1.2
    else if ((is_nav4 && (is_minor > 4.05)) || is_ie5) is_js = 1.3
    else if (is_nav5) is_js = 1.4
    // NOTE: In the future, update this code when newer versions of JS
    // are released. For now, we try to provide some upward compatibility
    // so that future versions of Nav and IE will show they are at
    // *least* JS 1.x capable. Always check for JS version compatibility
    // with > or >=.
    else if (is_nav && (is_major > 5)) is_js = 1.4
    else if (is_ie && (is_major > 5)) is_js = 1.3
    // HACK: no idea for other browsers; always check for JS version with > or >=
    else is_js = 0.0;

    // *** PLATFORM ***
    var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
    // NOTE: On Opera 3.0, the userAgent string includes "Windows 95/NT4" on all
    //        Win32, so you can't distinguish between Win95 and WinNT.
    var is_win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));

    // is this a 16 bit compiled version?
    var is_win16 = ((agt.indexOf("win16")!=-1) || 
               (agt.indexOf("16bit")!=-1) || (agt.indexOf("windows 3.1")!=-1) || 
               (agt.indexOf("windows 16-bit")!=-1) );  

    var is_win31 = ((agt.indexOf("windows 3.1")!=-1) || (agt.indexOf("win16")!=-1) ||
                    (agt.indexOf("windows 16-bit")!=-1));

    // NOTE: Reliable detection of Win98 may not be possible. It appears that:
    //       - On Nav 4.x and before you'll get plain "Windows" in userAgent.
    //       - On Mercury client, the 32-bit version will return "Win98", but
    //         the 16-bit version running on Win98 will still return "Win95".
    var is_win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
    var is_winnt = ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1));
    var is_win32 = (is_win95 || is_winnt || is_win98 || 
                    ((is_major >= 4) && (navigator.platform == "Win32")) ||
                    (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1));

    var is_os2   = ((agt.indexOf("os/2")!=-1) || 
                    (navigator.appVersion.indexOf("OS/2")!=-1) ||   
                    (agt.indexOf("ibm-webexplorer")!=-1));

    var is_mac    = (agt.indexOf("mac")!=-1);
    var is_mac68k = (is_mac && ((agt.indexOf("68k")!=-1) || 
                               (agt.indexOf("68000")!=-1)));
    var is_macppc = (is_mac && ((agt.indexOf("ppc")!=-1) || 
                                (agt.indexOf("powerpc")!=-1)));

    var is_sun   = (agt.indexOf("sunos")!=-1);
    var is_sun4  = (agt.indexOf("sunos 4")!=-1);
    var is_sun5  = (agt.indexOf("sunos 5")!=-1);
    var is_suni86= (is_sun && (agt.indexOf("i86")!=-1));
    var is_irix  = (agt.indexOf("irix") !=-1);    // SGI
    var is_irix5 = (agt.indexOf("irix 5") !=-1);
    var is_irix6 = ((agt.indexOf("irix 6") !=-1) || (agt.indexOf("irix6") !=-1));
    var is_hpux  = (agt.indexOf("hp-ux")!=-1);
    var is_hpux9 = (is_hpux && (agt.indexOf("09.")!=-1));
    var is_hpux10= (is_hpux && (agt.indexOf("10.")!=-1));
    var is_aix   = (agt.indexOf("aix") !=-1);      // IBM
    var is_aix1  = (agt.indexOf("aix 1") !=-1);    
    var is_aix2  = (agt.indexOf("aix 2") !=-1);    
    var is_aix3  = (agt.indexOf("aix 3") !=-1);    
    var is_aix4  = (agt.indexOf("aix 4") !=-1);    
    var is_linux = (agt.indexOf("inux")!=-1);
    var is_sco   = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1);
    var is_unixware = (agt.indexOf("unix_system_v")!=-1); 
    var is_mpras    = (agt.indexOf("ncr")!=-1); 
    var is_reliant  = (agt.indexOf("reliantunix")!=-1);
    var is_dec   = ((agt.indexOf("dec")!=-1) || (agt.indexOf("osf1")!=-1) || 
           (agt.indexOf("dec_alpha")!=-1) || (agt.indexOf("alphaserver")!=-1) || 
           (agt.indexOf("ultrix")!=-1) || (agt.indexOf("alphastation")!=-1)); 
    var is_sinix = (agt.indexOf("sinix")!=-1);
    var is_freebsd = (agt.indexOf("freebsd")!=-1);
    var is_bsd = (agt.indexOf("bsd")!=-1);
    var is_unix  = ((agt.indexOf("x11")!=-1) || is_sun || is_irix || is_hpux || 
                 is_sco ||is_unixware || is_mpras || is_reliant || 
                 is_dec || is_sinix || is_aix || is_linux || is_bsd || is_freebsd);

    var is_vms   = ((agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1));
    
    var showExtraConfigInfo = false;

// openAppletTag
//
// This function outputs the start of an HTML tag. It must be balanced by a call
// to closeAppletTag. The parameters to the function are:
//
// codeStr - the name of the applet .class file (including the ".class" ending.
// archiveStr - the (optional) name of a .jar file, or list of comma separated jars, 
//				that contains the applet code. Use "" if
//				an archive attribute is not applicable.
// showInfoStr - openAppletTag will optionally print out extra configuration info
//				in addition to the applet tag. This may be useful if you have an applet 
//				specifically designed to diagnose installation problems. showInfoStr should 
//				be "true" if you would like this additional info output to the HTML file.
// width, height - the width and height of the applet
//
// This code outputs the follwing tags for the given browser/os combinations:
//
// win/netscape				<embed> tag that uses the SUN Java Plugin for windows
// win/internet explorer	<object> tag as defined by Microsoft
// mac/netscape				<embed> tag that uses the Java Plugin from Mozilla
// mac/internet explorer	<applet> tag
// icab						<applet> tag
function openAppletTag( codeStr, archiveStr, showInfoStr, width, height ) {
	showExtraConfigInfo = showInfoStr == "true";
	if (is_iCab) {
		document.write("<APPLET HEIGHT=\"460\" WIDTH=\"600\" ");
		document.write("  CODE=\"" + codeStr + "\"") ;
		document.write("  ARCHIVE=\"" + archiveStr + "\"") ;
		document.write(">");
	}
	if (is_win) {
		if (showExtraConfigInfo) 
			document.write("You are using a <strong>Windows</strong> computer with ");
		if (is_nav) {
			if (showExtraConfigInfo)
				document.write("<strong>Netscape Navigator</strong>.<p>");			
			if (is_nav4up) {
				if (showExtraConfigInfo)
					document.write("If you see a picture of a puzzle piece then you need to install the Java Plug-in. Click on the puzzle piece for installation instructions.<p>");
				document.write("<EMBED ");
				document.write("  type=\"application/x-java-applet;version=1.2.2\" ");
				document.write("  WIDTH=" + width + " HEIGHT=" + height + " align=baseline HSPACE=0 VSPACE=0");
				if (codeStr != "")
					document.write("  code=" + codeStr);
				if (archiveStr != "")
					document.write("  archive="+archiveStr);
				document.write("  pluginspage=\"http://java.sun.com/products/plugin/1.2.2/plugin-install.html\"");
			}
			else {
				if (showExtraConfigInfo)
					document.write("<p>However, you");
				else
					document.write("<p>You");
				document.write(" are using an older version of the browser. To run ESCOT on a Windows machine you must have either Navigator 4 or IE 4.<br>");
				document.write("Please download and install one of the following browsers and then return to this page for more info.");
				document.write("the latest version of <a href=\"http://home.netscape.com/computing/download/index.html\">Netscape 4.7</a> or <a href=\"http://www.microsoft.com\">Internet Explorer</a> before continuing.");
			}
		}
		else if (is_ie) {
			if (showExtraConfigInfo)
				document.write("<strong>Internet Explorer</strong>.<p>");			
			if (is_ie4up) {
				if (showExtraConfigInfo)
					document.write("If you see a picture of a puzzle piece then you need to install the Java Plug-in. Click on the puzzle piece for installation instructions.<p>");
				document.write("<object  classid=\"clsid:8AD9C840-044E-11D1-B3E9-00805F499D93\"");
				document.write("VSPACE=0 HSPACE=0 ALIGN=middle WIDTH=" + width + " HEIGHT=" + height + " ");
				document.write("codebase=\"http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0\">");
				document.write("  <PARAM name=type value=\"application/x-java-applet;version=1.2.2\">");
				document.write("  <PARAM name=pluginspage value=\"http://java.sun.com/products/plugin/1.2.2/plugin-install.html\">");
				if (codeStr != "")
					document.write("  <PARAM name=CODE value=\"" + codeStr + "\">");
				if (archiveStr != "")
					document.write("  <PARAM name=archive value=\"" + archiveStr + "\">");
				document.write("  <PARAM name=scriptable value=true>");
			}
			else {
				if (showExtraConfigInfo)
					document.write("<p>However, you");
				else
					document.write("<p>You");
				document.write(" are using an older version of the browser. ");
				document.write("To run ESCOT on a Windows machine you must have either Navigator 4 or IE 4.<br>");
				document.write("Please download and install the latest version of Internet Explorer or Microsoft Internet Explorer before continuing.");
				document.write("<ul>");
				document.write("<li><a href=\"http://home.netscape.com/computing/download/index.html\">Netscape 4.7</a>");
				document.write("<li><a href=\"http://www.microsoft.com/windows/ie/\">Internet Explorer</a>");
				document.write("</ul>");
			}
		}
		else {
			if (showExtraConfigInfo)
				document.write("an <strong>unknown</strong> browser (Not Netscape or IE).<p>");			
		}
	}
	else if (is_mac) {
		if (showExtraConfigInfo)
			document.write("You are using a <strong>Macintosh</strong> computer with ");
		if (is_nav) {
			if (showExtraConfigInfo)
				document.write("<strong>Netscape Navigator</strong>.<p>");			
			if (is_nav4up) {
				if (showExtraConfigInfo)
					document.write("If you see a picture of a puzzle piece then you need to install additional software. Click on the puzzle piece for installation instructions.<p>");
				document.write("<embed type=application/x-java-applet");
				document.write(" PLUGINSPAGE = \"http://www.escot.org/applets/setup/detector/macinstaller.html\"");
				if (codeStr != "")
					document.write("  code=" + codeStr);
				if (archiveStr != "")
					document.write("  archive=" + archiveStr);
				document.write(" minimumMRJVersion=2.2.3");
				document.write(" installerLocation=http://www.escot.org/applets/setup/detector/macinstaller.html");
				document.write(" WIDTH=" + width + " HEIGHT=" + height + " align=middle");
			}
			else {
				if (showExtraConfigInfo)
					document.write("<p>However, you");
				else
					document.write("<p>You");
				document.write(" are using an older version of the browser. ");
				document.write("To run ESCOT on a Macintosh you must have either Navigator 4 or IE 4.<br>");
				document.write("Please download and install the latest version of <a href=\"http://www.netscape.com\">Netscape</a> or <a href=\"http://www.microsoft.com\">Internet Explorer</a> before continuing.");
			}
		}
		else if (is_ie) {
			if (showExtraConfigInfo)
				document.write("<strong>Internet Explorer</strong>.<p>");			
			if (is_ie4up) {
				document.write("<APPLET WIDTH=" + width + " HEIGHT=" + height + " HSPACE = 0 VSPACE = 0 ALIGN = middle");
				if (codeStr != "")
					document.write(" code=" + codeStr);
				if (archiveStr != "")
					document.write(" archive=" + archiveStr);
				document.write(">");
				document.write("You do not have Java installed on your machine.");
				document.write("<p>Please install Java using the instructions at<p>http://www.escot.org/applets/setup/detector/macinstaller.html");
				document.write("<PARAM NAME=\"minimumMRJVersion\" VALUE=\"2.2.3\">");
				document.write("<PARAM NAME=\"installerLocation\" VALUE=\"http://www.escot.org/applets/setup/detector/macinstaller.html\">");
			}
			else {
				if (showExtraConfigInfo)
					document.write("<p>However, you");
				else
					document.write("<p>You");
				document.write(" are using an older version of the browser. ");
				document.write("To run ESCOT on a Macintosh you must have either Navigator 4 or IE 4.<br>");
				document.write("Please download and install the latest version of Netscape Navigator or Microsoft Internet Explorer before continuing.");
				document.write("<ul>");
				document.write("<li><a href=\"http://home.netscape.com/computing/download/index.html\">Netscape 4.7</a>");
				document.write("<li><a href=\"http://home.netscape.com/browsers/6/index.html\">Netscape 6.0 (experimental)</a>");
				document.write("<li><a href=\"http://www.microsoft.com/mac/download/\">Internet Explorer</a>");
				document.write("</ul>");
			}
		}
		else {
			if (showExtraConfigInfo)
				document.write("an <strong>unknown</strong> browser (Not Netscape or IE).<p>");			
		}
	}
	else {
		if (showExtraConfigInfo)
			document.write("You are using an <strong>unknown</strong> operating system. (Not Mac or Windows).");			
	}
}

// outputAppletParameter
//
// Call this function once for each applet parameter you would like to include in the
// HTML applet tag
function outputAppletParameter( name, value ) {
	if (is_iCab) {
		document.write("<PARAM name=" + name + " value=\"" + value + "\">");
	}
	if (is_win) {
		if (is_nav) {
			if (is_nav4up) {
				document.write("  " + name + "=\"" + value + "\"");
			}
		}
		else if (is_ie) {
			if (is_ie4up) {
				document.write("  <PARAM name=" + name + " value=\"" + value + "\">");
			}
		}
	}
	else if (is_mac) {
		if (is_nav) {
			if (is_nav4up) {
				document.write(" " + name + "=\"" + value + "\"");
			}
		}
		else if (is_ie) {
			if (is_ie4up) {
				document.write("<PARAM name=" + name + " value=\"" + value + "\">");
			}
		}
	}
}

// closeAppletTag
//
// Writes the closing applet tag information. Also writes additional configuration info
// if showInfoStr was true in the call to openAppletTag(...).
function closeAppletTag() {
	if (is_iCab) {
		document.write("</APPLET>");
	}
	if (is_win) {
		if (is_nav) {
			if (is_nav4up) {
				document.write(">");
				document.write("  <noembed>");
				document.write("  <p>The Java Plugin did not startup. Please contact ESCOT support at");
				document.write("  </noembed>");
				document.write("</embed>");
				// recover from Java Plugin not enabled
				document.write("<p>If you see the message \"Java is not enabled...\", click <a href=\"http://www.escot.org/applets/setup/detector/enableplugin.html\" target=\"Enable Plugin\">here</a> to find out how to enable Java.");
			}
		}
		else if (is_ie) {
			if (is_ie4up) {
				document.write("</object>");
				document.write("<p>If you see the message \"Java is not enabled...\", click <a href=\"http://www.escot.org/applets/setup/detector/enableplugin.html\" target=\"Enable Plugin\">here</a> to find out how to enable Java.");
			}
		}
	}
	else if (is_mac) {
		if (is_nav) {
			if (is_nav4up) {
				document.write(">");
				document.write("<noembed>");
				document.write("You do not have Java installed on your machine.");
				document.write("<p>Please install Java using the instructions on this <a href=macinstaller.html>download page</a><p>http://www.escot.org/applets/setup/detector/macinstaller.html");
				document.write("</noembed>");
				document.write("</embed>");
			}
		}
		else if (is_ie) {
			if (is_ie4up) {
				document.write("</Applet>");
			}
		}
	}
	
	if (showExtraConfigInfo) {
		document.write("<font size=\"-1\">");
		document.write("<p>For internal use only: ");
		document.write(navigator.userAgent);
		document.write("</font>");
	}
}