function but_up(tag$) {
document.images[tag$].src = "Images/layout/"+tag$+"_up.jpg";
}

function but_down(tag$) {
document.images[tag$].src = "Images/layout/"+tag$+"_down.jpg";
}

function info_dis(div) {
var dis;
dis = document.getElementById(div);

if (dis.style.display == "none") {
	dis.style.display = "block";
	return true;
	} 
if (dis.style.display == "block") {
	dis.style.display = "none";
	return true;
	}
}