function popup(page,title,width,height){
	var winl = (screen.width-width)/2;
 	var wint = (screen.height-height)/2; 
	window.open(''+page,''+title,'width='+width+',height='+height+',top='+wint+',left='+winl+',resizable=no,scrollbars=yes,toolbar=no'); 
}