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

// it's a minimized/compressed, self execution (no library required)
// example: alert(ie);
//          return undefined (if the browser was not IE)
//          or
//          return browser version (if IE detected)

Internet explorer detection with its version in javascript

JavaScript