function GetStyle(name)
{
	if (document.getElementById) {
		return document.getElementById(name).style;
	} else if (document.all) {
		return document.all[name].style;
	} else {
		var el =  document.layers[name];
		if (el != null) return el;
		for (var i = 0; i < document.layers.length; i++) {
			el =  document.layers[i].document.layers[name];
			if (el != null) return el;
		}
	}
}


function styleRoll(span, vis)
{
	var el = GetStyle(span);
	var state = vis? 'visible':'hidden';
	el.visibility = state;
}
function imageSwap3On(span)
{	
	styleRoll(span, true);
}
function imageSwap3Off(span)
{	
	styleRoll(span, false);
}