function Ventana(url) {
  ventana = window.open(url,"",'scrollbars=no,width=315,height=290,top=30,left=5');
	ventana.focus();
  document.returnValue = false;
}

function Descarga(url) {
  ventana = window.open(url,"",'scrollbars=no,width=520,height=140,top=30,left=5');
	ventana.focus();
  document.returnValue = false;
}