function popup(link,title,width,height){
	var left=(screen.width)?(screen.width-width)/2:0;
	var top=(screen.height)?((screen.height-height)/2)-50:0;
	window.open(link,null,"menubar=no,width="+width+",height="+height+",top="+top+",left="+left+",scrollbars=yes,toolbar=no");
	return false;
}