// JavaScript Document

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)
  alert("You're using Internet Explorer 6 or below. To view this site properly you will need to upgrade your browser.")
}
else
 document.write()