Stop firefox from prompting to open jnlp file

Love JWS!!
Works great for me on both IE and FF browsers using a little bit of JavaScript.
The only drawback I see is that Firefox will prompt the user to open file.jnlp with the default download/open dialog.
Anyone know how to prevent this?
Do you implement the JS in a manner that is different, allowing seamless function in FF too?
heres what my launch page looks like for the notepad example;
<html>
<head>
<meta http-equiv="Content-Language" content="en" />
<meta name="GENERATOR" content="PHPEclipse 1.0" />
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Demo Web Launch</title>
<script language="JavaScript" type="text/javascript">
var detect = navigator.userAgent.toLowerCase();
var windowsIE = (checkPlatform("msie") && checkPlatform("win"));
function checkPlatform(string)
    place = detect.indexOf(string) + 1;
    return place;
</script>
</head>
<body bgcolor="#FFFFFF" text="#000000" link="#FF9966" vlink="#FF9966" alink="#FFCC99">
<script language="JavaScript" type="text/javascript">
if (windowsIE) {
    document.write("<OBJECT codeBase=http://java.sun.com/update/1.5.0/jinstall-1_5_0_05-windows-i586.cab classid=clsid:5852F5ED-8BF4-11D4-A245-0080C6F74284 height=0 width=0>");
    document.write("<PARAM name=app VALUE=http://java.sun.com/products/javawebstart/apps/notepad.jnlp>");
     document.write("<PARAM NAME=back VALUE=false>");
     document.write("</OBJECT>");
if (navigator.mimeTypes && navigator.mimeTypes.length) {
     webstartAvailable = navigator.mimeTypes['application/x-java-jnlp-file'];
if (!webstartVersionCheck("1.5")) {
     window.open("http://jdl.sun.com/webapps/getjava/BrowserRedirect?locale=en&host=java.com",
        "needdownload");
function webstartVersionCheck(versionString) {
    // Mozilla may not recognize new plugins without this refresh
    navigator.plugins.refresh(true);
    // First, determine if Web Start is available
    if (navigator.mimeTypes['application/x-java-jnlp-file']) {
        // Next, check for appropriate version family
        for (var i = 0; i < navigator.mimeTypes.length; ++i) {
            pluginType = navigator.mimeTypes.type;
if (pluginType == "application/x-java-applet;version=" + versionString) {
return true;
launchTID =setInterval('launchJNLP("http://java.sun.com/products/javawebstart/apps/notepad.jnlp")',
     100);
function launchJNLP(app) {
if (webstartVersionCheck("1.5")) {
clearInterval(launchTID);
window.location = app;
</script>
</body>
</html>

Right, well I was more thinking about other end users than myself, and their first visit.
I think the prompt with an unknown file type might be discomforting for some of my visitors.
Did I read right however, that with the updates to 1.6 will come a fix to this?
In other words, Joe Blow, first-timer comes, clicks, and voila! open application, just like IE.
Thanks!

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