// 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("This website works best when viewed through Internet Explorer 7 and newer, FireFox 3 and newer, or Safari 3 and newer")
 else if (ieversion<=5)
  alert("This website works best when viewed through Internet Explorer 7 and newer, FireFox 3 and newer, or Safari 3 and newer")
}