function openpopup(url) {

               var theURL=url;
               var winName='popup_cokezero';
               var width=500;
               var height=580;
               var topY=(screen.height-height)/2;
               var leftX=(screen.width-width)/2;
               var features='innerWidth=' + width+',innerHeight='+height+',width=' + width+',height='+height+',top='+topY+',left='+leftX+',resizable=0,srollbars=0';

        
            var popup=window.open(theURL,winName,features);
               popup.focus();
}