function popup(link, width, height, name) { 
	var href = link.href;
	
  	var wleft = (screen.width - width) / 2;
  	var wtop = (screen.height - height) / 2;
	window.open(link, name, "location=0,scrollbars=1,resizeable=1,width="+width+",height="+height+",top="+wtop+",left="+wleft);
}