function abrir(URL) {

  var width = W;
  var height = H;

   var left = 150;
   var top = 150;

   window.open(URL,'Quero Topo', 'width='+width+', height='+height+', top='+top+', left='+left+', scrollbars=no, status=no, toolbar=no, location=no, directories=no, menubar=no, resizable=no, fullscreen=no');

}