function getObjRef(ref,where)
{
	var d,x,n;
	var y;
	if (where==null) d = document;
	else d = where.document;
	if(d.getElementById)
	{
		y = d.getElementById(ref);
	} else if(document.all) {
		y = document.all[ref];
	} else if(d.layers) {
		y = d.layers[ref];
		for(x=0;!y&&x<d.layers.length;x++)
		{
			y = getObjRef(ref,d.layers[x]);
		}
	}
	return y;
}
function setLayerVis(id, vis)
{
	if(document.getElementById)
	{
	  	vis = (vis=="show") ? 'visible' : 'hidden';
		getObjRef(id).style.visibility = vis;
	} else if(document.layers) {
		getObjRef(id).visibility = vis;
	}
}