function IEdetect() {
   var agent = navigator.userAgent.toLowerCase(); 
   this.isOpera       = (agent.indexOf('opera') != -1); 
   this.isIE          = (!this.isOpera && agent.indexOf('msie') != -1 && (agent.indexOf('webtv') == -1));
   if(this.isIE)
   return 1;
   else return 0;
}