//Função para abrir nova janela
function abre_janela(width, height, nome) {
var top; var left;
top = ( (screen.height/2) - (height/2) )
left = ( (screen.width/2) - (width/2) )
window.open('',nome,'width='+width+',height='+height+',scrollbars=yes,toolbar=no,location=no,status=no,menubar=no,resizable=no,left='+left+',top='+top);
}