// ocultar div
function desplegable(obj) {
	var el = window.document.getElementById(obj);
	if ( el.style.display != 'none' ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = '';
	}
}
// expandir div y ocultar los otros solo vale pare este ejemplo de pagina no es estandar como el anterior
<!---
function expand(what,what1,what2)
{
	// Muestra u oculta el componente "what", pasado como parámetro
	if (document.getElementById(what).style.display=='none'){
		document.getElementById(what).style.display='';
		<!--document.getElementById('button_expand_'+what).innerHTML=" "+ what1;-->
		
	}
	document.getElementById(what1).style.display='none'
	document.getElementById(what2).style.display='none'
	desactivar_mensaje_cabecera('m_mensaje_cabecera');
}

//20080627_UOA++
function desactivar_mensaje_cabecera(id_a_quitar)
{
	document.getElementById(id_a_quitar).style.display='none'
}
//20080627_UOA--

function expand_flash(what,what1,what2,what3){
	// Muestra u oculta el componente "what", pasado como parámetro
	if (document.getElementById(what).style.display=='none'){
		document.getElementById(what).style.display='';
		<!--document.getElementById('button_expand_'+what).innerHTML=" "+ what1;-->
		
	}
	else{
		document.getElementById(what).style.display='none'
		<!--document.getElementById('button_expand_'+what).innerHTML=" "+ what1;-->
	}
	document.getElementById(what1).style.display='none'
	document.getElementById(what2).style.display='none'
	document.getElementById(what3).style.display='none'
}
//-->
/*////////////////// VISUALIZACIÓN DE LAS IMAGENES PNG ///////////////////////*/
function fnLoadPngs(){
	var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
	var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5);

	for (var i = document.images.length - 1, img = null; (img = document.images[i]); i--) {
		if (itsAllGood && img.src.match(/\.png$/i) != null) {
			fnFixPng(img);
			img.attachEvent("onpropertychange", fnPropertyChanged);
		}
		img.style.visibility = "visible";
	}

	var nl = document.getElementsByTagName("INPUT");
	for (var i = nl.length - 1, e = null; (e = nl[i]); i--) {
		if (e.className && e.className.match(/\bimage\b/i) != null) {
			if (e.src.match(/\.png$/i) != null) {
				fnFixPng(e);
				e.attachEvent("onpropertychange", fnPropertyChanged);
			}
			e.style.visibility = "visible";
		}
	}
}

function fnPropertyChanged() {
	if (window.event.propertyName == "src") {
		var el = window.event.srcElement;
		if (!el.src.match(/x\.gif$/i)) {
			el.filters.item(0).src = el.src;
			el.src = "x.gif";
		}
	}
}

function dbg(o) {
	var s = "";
	var i = 0;
	for (var p in o) {
		s += p + ": " + o[p] + "\n";
		if (++i % 10 == 0) {
			alert(s);
			s = "";
		}
	}
	alert(s);
}

function fnFixPng(img) {
	var src = img.src;
	img.style.width = img.width + "px";
	img.style.height = img.height + "px";
	img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')"
	img.src = "x.gif";
}