function popup(url) {
//	alert("inside popup");
      var url;
       var height = 800
       var width = 1080
       winLeft = (screen.availWidth - width)/2;
       winTop = (screen.availHeight - height)/2-20;
       var attributes = "status=yes,toolbar=no,width="+width+",height="+height+ ",screenX=" + winLeft + ",screenY=" +
              winTop +  ",left=" + winLeft + ",top=" + winTop + ",scrollbars=yes,resizable=yes";
           // if popup  window already exists and is open, bring the window to the front
 
       if (window.popupWin && window.popupWin.closed == false) {    
              window.popupWin.location.href = url;
		    window.popupWin.focus();
       }
	else {
         popupWin = window.open(url,"popup",attributes);
         window.popupWin.focus();
    }

}