function AbreJanela(url,nome,largura,altura){
posx = (screen.width/2)-(largura/2)
posy = (screen.height/2)-(altura/2)

window.open(url, nome, "width=" + largura + ",height=" + altura + ",left="+posx+",top="+posy+", location=no,toolbar=no,menubar=no,scrollbars=auto,status=no,resizable=no"); 
}