function muestra(num){
	var i, obj = document.getElementById("submenu" + num);
	if (obj.style.display == "block"){
		obj.style.display = "none";
		//hide();
	}else{
		for (i=1; i<=2; i++)
			document.getElementById("submenu" + i).style.display = "none";
		obj.style.display = "block";	
	}
}
function fondo(num){
	var obj = document.getElementById("principal");
	if (num==1){
		obj.style.backgroundImage = "url(images/fondo_general.jpg)";
	}else{
		obj.style.backgroundImage = "url(images/fondo_interno.jpg)";
	}
}
function show(frm){
	var obj = document.getElementById("contenido_frame");
	obj.style.display = "block";
	obj.src = frm + ".html";
	obj = document.getElementById("boton_video");
	obj.style.display = "block";
	obj = document.getElementById("contenido_video");
	obj.style.display = "none";
	fondo(2);
}
function hide(){
	var obj = document.getElementById("contenido_frame");
	obj.style.display = "none";
	fondo(1);
}
function video(){
	var obj = document.getElementById("contenido_video");
	obj.style.display = "block";
	obj = document.getElementById("boton_video");
	obj.style.display = "none";
	fondo(1);
	hide();
}
function video_off(){
	var obj = document.getElementById("contenido_video");
	obj.style.display = "none";
	obj = document.getElementById("boton_video");
	obj.style.display = "none";
}