n4 = (document.layers)? true:false
 ie = (document.all)? true:false
 n6 = (document.getElementById)? true:false

function show(id) {
	if (n4) document.ventana.document.layers[id].visibility = "show"
    else if (ie) document.all[id].style.visibility = "visible"
    else if (n6) document.getElementById(id).style.visibility = "visible"
}
function hide(id) {
	if (n4) document.ventana.document.layers[id].visibility = "hide"
	else if (ie) document.all[id].style.visibility = "hidden"
    else if (n6) document.getElementById(id).style.visibility = "hidden"
}

function Menu(menu, post) {
	for(i=1; i < 7; i++) {
		if (eval('document.getElementById(\'menu' + i + '0' + post + '\')')) {
			if(i != menu) {
				show('menu' + i + '1' + post);hide('menu' + i + '0' + post);
				hide('caja' + i + post)
			} else {
				show('menu' + i + '0' + post);hide('menu' + i + '1' + post);
				show('caja' + i + post)
			}
		} else {
			break
		}
	}
}