Make HTML5 Elements Work in Old IE

(function() {

    if (! /*@cc_on!@*/ 0) return;

    var e = "abbr,article,aside,audio,bb,canvas,datagrid,datalist,details,

dialog,eventsource,figure,footer,header,hgroup,mark,menu,meter,nav,

output,progress,section,time,video".split(','),

        i = e.length;

    while (i--) {

        document.createElement(e[i])

    }

})()

Hotlink Script:

<!--[if IE]>

<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>

<![endif]-->

Detect Internet Explorer

<script type="text/javascript">
    if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)) {
//test for MSIE x.x;
        var ieversion = new Number(RegExp.$1)
// capture x.x portion and store as a number
        if (ieversion >= 8)
            document.write("You're using IE8 or above")
        else if (ieversion >= 7)
            document.write("You're using IE7.x")
        else if (ieversion >= 6)
            document.write("You're using IE6.x")
        else if (ieversion >= 5)
            document.write("You're using IE5.x")
    } else
        document.write("n/a")
</script>

Detect Javascript On/Off, With Notification

<script type="text/javascript"> document.write("Welcome, you have Javascript on.") </script> <noscript>JavaScript is off. Please enable to view full site.</noscript>

If JavaScript is on the user gets a welcome message. If off, the user is instructed to turn it on.