function openPop(page) {

 coordx= screen.width ? (screen.width-570)/2 : 0;
 coordy= screen.height ? (screen.height-450)/2 : 0;
 window.open(page,'window','scrollbars=1,status=1,toolbar=0,width=570,height=450,top='+coordy+',left='+coordx);

}