if (/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent)){ //test for Firefox/x.x or Firefox x.x (ignoring remaining digits);
 var ffversion=new Number(RegExp.$1) // capture x.x portion and store as a number
 if (ffversion>=3)
 {
  // document.write('<link rel="stylesheet" type="text/css" href="ff3.css">');
  // document.write("You're using FF 3.x or above")
 }
 else if (ffversion>=2)
 {
  document.write('<link rel="stylesheet" type="text/css" href="/Portals/_default/Skins/ROF/ff2.css">');
//  document.write("You're using FF 2.x")
 }
 // else if (ffversion>=1)
 // {
 //  document.write('<link rel="stylesheet" type="text/css" href="ff1.css">');
 //  document.write("You're using FF 1.x")
 // }
}
// else
// 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>=8)
//  {
//   document.write('<link rel="stylesheet" type="text/css" href="ie8.css">');
//   document.write("You're using IE8.x or above")
//  }
//  else if (ieversion>=7)
//  {
//   document.write('<link rel="stylesheet" type="text/css" href="ie7.css">');
//   document.write("You're using IE7.x")
//  }
//  else if (ieversion>=6)
//  {
//   document.write('<link rel="stylesheet" type="text/css" href="ie6.css">');
//   document.write("You're using IE6.x")
//  }
//  else if (ieversion>=5)
//  {
//   document.write('<link rel="stylesheet" type="text/css" href="ie5.css">');
//   document.write("You're using IE5.x")
//  }
// }
// else
// document.write("n/a")