function openwin(url)
{
		var page,wit,hei;
	    wit=770;
	    hei=550;
		l=screen.width/2-wit/2;
		t=screen.height/2-hei/2;
		page=window.open(url,"","width="+wit+",height="+hei+", toolbar=no, menubar=no, scrollbars=yes, resizable=yes, location=no, status=no");
		page.moveTo(l,t);
}