Check if IE

ie-test.js

/* Check if IE - http://msdn.microsoft.com/en-us/library/ms537509(v=vs.85).aspx */
var getIEVersion = function() {
// Returns the version of Internet Explorer or a -1
// (indicating the use of another browser).
  var rv = -1; // Return value assumes failure.
  if (navigator.appName == 'Microsoft Internet Explorer') {
    var ua = navigator.userAgent;
    var re  = new RegExp(/MSIE ([0-9]{1,}[\.0-9]{0,})/);
    if (re.exec(ua) !== null)
      rv = parseFloat( RegExp.$1 );
  }
  return rv;
};

var ieVersion = getIEVersion();

var isIE = ( ieVersion > 0 ? true : false);