var prevObjectID = null;
var prevLayer = 0;			

function setLayer(objectID,layerNum) {
	var dom = findDOM(objectID,1);
	dom.zIndex = layerNum;
}

function findLayer(objectID) {
	var dom = findDOM(objectID,1);
	if (dom.zIndex != null)
		return dom.zIndex;
	return (null);
}

function swapLayer(objectID) {
 if (prevObjectID != null) 
 	setLayer(prevObjectID,prevLayer);
 prevLayer = findLayer(objectID);
 prevObjectID = objectID;
 setLayer(objectID,1000);
}