function layer(id,d){
	if(!d)d = document;
	if(d.getElementById) return d.getElementById(id);
	if(d.all) return d.all[id];
	if(d.layers) return d.layers[id];
	return null;
}

function roll_b(id, v){
	layer(id).src = '/images/'+v;
}

function ShowOrHide(id) {
	var item = null;
	if (document.getElementById) {
		item = document.getElementById(id);
	} else if (document.all){
		item = document.all[id];
	} else if (document.layers){
		item = document.layers[id];
	}
	if (!item) {
	}else 	if (item.style) {
			if (item.style.display == "none"){ item.style.display = ""; 
		}else{
			item.style.display = "none"; 
		}
	}else{ 
		item.visibility = "show"; 
	}
}