document.getElementsByClassName = function(cl, sTagName) {  
		var retnode = [];  
		var myclass = new RegExp('\\b'+cl+'\\b');  
		var elem = this.getElementsByTagName((sTagName===""||sTagName===null)?"*":sTagName);  
		for (var i = 0; i < elem.length; i++) {  
			var classes = elem[i].className;  
			if (myclass.test(classes)) retnode.push(elem[i]);  
		}  
	return retnode;  
} 
function abrirSubmenu(nombre){
		var elemento = document.getElementById(nombre);
		var elementosSubMenu = document.getElementsByClassName('menuSecundario','')
		var mostrar = false;
		if (elemento.style.display=='none' || elemento.style.display==''){
			mostrar = true
		}
		for(var indiceElementeSubMenu in elementosSubMenu){
			elementosSubMenu[indiceElementeSubMenu].style.display = 'none';
		}
		if (mostrar){
			elemento.style.display = 'block';
		}else{
			elemento.style.display = 'none';
		}		
	}