function EscondeVentana(elementName) {

	var BodyElement = null; 
	var Upimage = null;
	var DownImage = null;
	if(document.getElementsByName) {
		BodyElement = document.getElementsByName(elementName);
		if(BodyElement) {	
			if(BodyElement[0].style.display == "none") {
				BodyElement[0].style.display = "block";
			} else {
				BodyElement[0].style.display = "none";
			}
		}	
	}
	window.event.cancelBubble = true;
	return false;

}