function ver_noticia(nueva_pagina)
{
var ancho_popup=300;
var H = (screen.height - ancho_popup) / 2;
var largo_popup=400;
var L = (screen.width - largo_popup) / 2;
pop_up = window.open(nueva_pagina,"Popup","status=yes,scrollbars=yes,resizable=no,height="+ancho_popup+",width="+largo_popup+",top="+H+",left="+L);
}