// JavaScript Document

function blocking(nr)
{
	if (document.layers)
	{
		current = (document.layers[nr].display == 'none') ? 'block' : 'none';
		document.layers[nr].display = current;
	}
	else if (document.all)
	{
		current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
		document.all[nr].style.display = current;
	}
	else if (document.getElementById)
	{
		vista = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = vista;
	}
	cerrarLayers(nr);
}

function cerrarLayers(str){
	var navObj = document.getElementById('cabezal').getElementsByTagName("div");
	for(var L = 0; L< navObj.length ;L++){
		if(navObj[L].getAttribute('name') == 'nav' && navObj[L].id != document.getElementById(str).id){
		
			 navObj[L].style.display = "none"; 
		}
	}
}