var elementosdesc = new Array("desc1", "desc2", "desc3", "desc4");
var menudesc = new Array("adesc1", "adesc2", "adesc3", "adesc4");

function verdesc(elemento){
	ocultadesc();
	document.getElementById("desc").style.display = "none";
	document.getElementById(elementosdesc[parseInt(elemento)]).style.display = "block";
	document.getElementById(menudesc[parseInt(elemento)]).className = "productoactivo";
}

function ocultadesc(){
	for (var i=0; i<elementosdesc.length; i++){
		document.getElementById(elementosdesc[i]).style.display = "none";
			document.getElementById("desc").style.display = "block";
		document.getElementById(menudesc[i]).className = "productonoactivo";
	}
}