// JavaScript Document
	function muestra( id ) {

		var capa = document.getElementById(id);
		if( capa.className == "visible" )
			capa.className = "oculto" ;
		else
			capa.className = "visible" ;
	}

    function cambiaTodos (name,css){
		var capas = document.getElementsByName(name);
		for (i=0; i<capas.length; i++){
			capas[i].className = css;
		}
	}