<SCRIPT LANGUAGE="JavaScript">
<!-- Developers should be aware that for Gecko-based browsers (NS 6.x) -->
<!-- Java Web Start might not be installed ------------------------------>
if (javawsInstalled) {
<!--StartFragment -->
document.write("<table>");
document.write("<td></td><td>");
document.write("<img src='images/checked.gif'><big><font
color='#990000'><b> Step 1: </b></font></big>");
document.write("It appears that Java is already installed (good!),
so you can go on to next step.");
document.write("<ul><i>(In case of problems, you
can <a href=\"http://www.java.com/en/download/windows_automatic.jsp\" onClick=\"window.open('http://www.java.com/en/download/windows_automatic.jsp',
null,'toolbar=no, directories=no, location=no, status=yes, menubar=no,
resizable=no, scrollbars=no, width=800, height=600'); return false\">click
here</a> to re-install the Java environment that is required
by your_application_name)</i></ul>");
document.write("</td><tr>");
document.write("<td></td><td>");
document.write("<img src='images/unchecked.gif'><big><font
color='#990000'><b> Step 2: </b></font></big>");
document.write("Click here to run your application(Add your
jnlp file link here). ");
document.write("</td><tr>");
document.write("</table>");
}
else {
document.write("<p><table><td>");
document.write("<big>We have detected that Java Web Start
needs to be installed before you can proceed.");
document.write("This is a simple two step process and you will
only need to perform <b><i> the first step once. </i></b>");
document.write("Once you start the first step, an install window
will pop up and you will be guided through the installation.");
document.write("This install process is simple and should take
only a few minutes.");
document.write("</big></td></table><p>");
document.write("<table>");
document.write("<td></td><td>");
document.write("<img src='images/unchecked.gif'><big><font
color='#990000'><b> Step 1: </b></font></big>");
document.write("<a href=\"http://www.java.com/en/download/windows_automatic.jsp\" onClick=\"window.open('http://www.java.com/en/download/windows_automatic.jsp',
null,'toolbar=no, directories=no, location=no, status=yes, menubar=no,
resizable=no, scrollbars=no, width=800, height=600'); return false\"> Click
here</a> to install the Java environment that is required by
ArrayTrack.");
document.write("</td><tr>");
document.write("<td></td><td>");
document.write("<img src='images/unchecked.gif'><big><font
color='#990000'><b> Step 2: </b></font></big>");
document.write("Click here to run your application(Add your
jnlp file link here). ");
document.write("</td><tr>");
document.write("</table>");
}
How
to do it? Add the following code to your <head></head> section.
These scripts detects whether JAVA web start is installed for
Netscape of Internet explore. The original code is from 
Add
the following code to the proper place in your page. Also,
you need download these two images ,checked.gif and unchecked.gif
used by the following script. 
.The
following code will dynamically provide the link to installJava
Web Start based on the above script detection result. 
