var navName = navigator.appName ;
var brVer = navigator.userAgent; var brNum; var reg = new RegExp('/');

function verNumIE() {
   var brVerId = brVer.indexOf('MSIE');
   brNum = brVer.substr(brVerId,8);
}
function verNumOt() {
   var brVerId = brVer.search(reg);
   brNum = brVer.substring(brVerId+1);
}
if (navigator.appName == 'Microsoft Internet Explorer') {
  verNumIE() ;
} else {
  verNumOt() ;
}