function isSupportedBrowser(){
  try {
    var userAgent = navigator.userAgent;
    if (userAgent) {
      var ind = userAgent.search("Firefox");
      if (ind > 0) {
        var version = parseFloat(userAgent.substring(ind + 8));
        return version >= 2;
      }
      
      var ind = userAgent.search("MSIE");
      
      if (ind > 0) {
        ind += 5;
        var versionEnd = userAgent.indexOf(';', ind);
        var version = parseFloat(userAgent.substring(ind, versionEnd));
        
        return version >= 7;
      }
    }
    
    return false;
  } catch (e) {
    return false;
  }
}