function SetVis(id){
	var div = document.getElementById(id);
	if (div.style.display == "none") {
		div.style.display = "block";
	} else {
		div.style.display = "none";
	}
}

function Mouseover(id, prefix) {
	document.getElementById(id).src = prefix+'images/navigation/'+id+'_dn.jpg';
}

function Mouseout(id, prefix){
	document.getElementById(id).src = prefix+'images/navigation/'+id+'_up.jpg';
}