function popup(archivo) {
		var hor
		var ver
		var ubix
		var ubiy
		ubix=585/2
		ubiy=265/2
		hor= screen.width/2-ubix;
		ver= screen.height/2-ubiy;
		archivos = window.open(archivo, "", "left="+hor+",top="+ver+",toolbar=0,location=0,directories=0,status=0,menubar=no,scrollbars=yes,resizable=no,width="+585+",height="+265);
	}
	
	function changeBack(targetID, src){
		if (targetID != menu_sel)
			document.getElementById(targetID).src = src;
	}
	
	function put_on(language){
		if (language != "es"){
			document.getElementById(menu_sel).src = '../imgs/btn_'+menu_sel+'_on.jpg';
		}
		else
		{
			document.getElementById(menu_sel).src = '../imgs/btn_'+menu_sel+'_on_es.jpg';
		}
		
	}