function BrowserCheck() {
  appname = navigator.appName;

  useragent = navigator.userAgent;

  
  var IEVersionCheck = -1

  if(appname == "Microsoft Internet Explorer") {
    if ((useragent.indexOf('MSIE 5.5')>0)) {IEVersionCheck = 5.5; }
    if ((useragent.indexOf('MSIE 6')>0)) {IEVersionCheck = 6; }
    if ((useragent.indexOf('MSIE 7')>0)) {IEVersionCheck = 7; }
    if ((useragent.indexOf('MSIE 8')>0)) {IEVersionCheck = 8; }
  }
  return IEVersionCheck; 
  
}