// Archivo JScript

 function Cover(bottom, top, ignoreSize) {
         var location = Sys.UI.DomElement.getLocation(bottom);
         top.style.position = 'absolute';
         top.style.top = location.y + 'px';
         top.style.left = location.x + 'px';
         if (!ignoreSize) {
             top.style.height = bottom.offsetHeight + 'px';
             top.style.width = bottom.offsetWidth + 'px';
             }
         }