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=yes,status=yes,resizable=yes"); 
}