IE_Version_Testing.js

// ----------------------------------------------------------
// A short snippet for detecting versions of IE in JavaScript
// without resorting to user-agent sniffing
// ----------------------------------------------------------
// If you're not in IE (or IE version is less than 5) then:
//     ie === undefined
// If you're in IE (>=5) then you can determine which version:
//     ie === 7; // IE7
// Thus, to detect IE:
//     if (ie) {}
// And to detect the version:
//     ie === 6 // IE6
//     ie > 7 // IE8, IE9 ...
//     ie < 9 // Anything less than IE9
// ----------------------------------------------------------

var ie = (function(i, v) {
    while (i.innerHTML = '<!--[if gt IE ' + (++v) + ']>1<![endif]-->', i.innerHTML > 0);
    return v > 4 ? v : 0;
}(document.createElement('i'), 3));

// Minified (144 chars)
var ie=(function(b,a){while(b.innerHTML="<!--[if gt IE "+(++a)+"]>1<![endif]-->",b.innerHTML>0);return a>4?a:0}(document.createElement("i"),3));