function abrepopup( url, nome, largura, altura )
{
  janela=window.open( url, nome, 'type=fullWindow,maximized=yes,screenX=0,screenY=0,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width='+largura+',height='+ altura );
  janela.focus();
}