function init() {
	subZeroLayer = new DynLayer("subZeroLayerDiv");
	subOneLayer = new DynLayer("subOneLayerDiv");
	subTwoLayer = new DynLayer("subTwoLayerDiv");
	subThreeLayer = new DynLayer("subThreeLayerDiv");
	subFourLayer = new DynLayer("subFourLayerDiv");
	subBlankLayer = new DynLayer("subBlankLayerDiv");
	subZeroLayer.show();
}

function findLayer(aLayerNum) {
	var whichLayer;
	if (aLayerNum==0) whichLayer="Blank";
	if (aLayerNum==1) whichLayer="One";
	if (aLayerNum==2) whichLayer="Two";
	if (aLayerNum==3) whichLayer="Three";
	if (aLayerNum==4) whichLayer="Four";
	return whichLayer;
}

function showhide(newLayer) {
	var lastImage = lastLayer + 2;
	if (lastImage == newLayer + 2) lastImage=0;
	eval("sub" + findLayer(lastLayer) + "Layer.hide()");
	eval("sub" + findLayer(newLayer) + "Layer.show()");
	if (lastLayer > 0) eval("MM_swapImage('navigation_1_0" + lastImage + "','','/heda/images/navigation.1_0" + lastImage + ".jpg',1)");
	lastLayer = newLayer;
}