function openpopupres(popurl)
{
//var popurl="http://site.com/page.htm"

var altura=window.screen.height;
var largura=window.screen.width;
var topo=(altura/2)-192; 
var  esquerda=(largura/2)-262;
var definicoes='toolbar=no,location=no,status=no,menubar=no,scrollbars=yes,resizable=no,width=565,height=525,top='+ topo + ',left=' + esquerda;


winpops=window.open(popurl,"",definicoes)
}