$(document).ready( function() {
  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 <= 6) {                                     // We don't support IE6 or older
      $("#browsererror").html("Warning: This version of Internet Explorer is not supported. Please upgrade to at least IE 7.0 or use a modern browser such as <a href='http://www.mozilla.com/en-US/'>Firefox</a>, <a href='http://www.google.com/chrome'>Chrome</a>, or <a href='http://www.opera.com/'>Opera</a>.");
      $("#browsererror").show();
    }
  }
});