function makevisible(cur,which){
	strength=(which==0)? 1 : 0.5
	if 
	(cur.style.MozOpacity)
	cur.style.MozOpacity=strength
	else if
	(cur.filters)
	cur.filters.alpha.opacity=strength*100
	else if
	(cur.style.opacity)
	cur.style.opacity=strength
}

function changeclass(id,classname){
	var obj = document.getElementById(id);
	if (obj) obj.className = classname;
}