//Función que muestra y oculta el DIV
function ToggleSubmenuNew(divsubmenu) 
{		
	var capa = document.getElementById(divsubmenu); 
	
	if(capa.style.display == 'none')
		capa.style.display = '';
	else
		capa.style.display = 'none'; 
		
}
<!-- Consigue mas JavaScript en http://www.mundojavascript.com -->
<!-- Swap images
function Permut (flag,img) {
if (document.images) {
	if (document.images[img].permloaded) {
		if (flag==1) document.images[img].src = document.images[img].perm.src
		else document.images[img].src = document.images[img].perm.oldsrc
	}
}
}
function preloadPermut (img,adresse) {
if (document.images) {
	img.onload = null;
	img.perm = new Image ();
	img.perm.oldsrc = img.src;
	img.perm.src = adresse;
	img.permloaded = true;
}
}

function open(){
	document.getElementById('pop').style.display='block';
	document.getElementById('fondo-negro').style.display='block';
}
function close(){
	document.getElementById('pop').style.display='none';
	document.getElementById('fondo-negro').style.display='none';
}
// -->