Browser detection

navigator.js

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>=9) {
  //IE9

 } else
 if(ieversion>=8) {
  //IE8

 } else
 if(ieversion>=7) {
  //IE7

 }
}


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>=5) {
 }
}