function switchLayer(currentLayer, newLayer) {
	// FIRST HIDE THE CURRENT LAYER
	var layerToHide, visCurrent;
	if(document.getElementById) // this is the way the standards work
		layerToHide = document.getElementById(currentLayer);
	visCurrent = layerToHide.style;
	visCurrent.display = 'none';
		
	// NOW SHOW THE NEW ONE IN ITS PLACE
	var layerToShow, visNew;
	if(document.getElementById) // this is the way the standards work
		layerToShow = document.getElementById(newLayer);
	visNew = layerToShow.style;
	visNew.display = 'block';
	  
	// FINALLY, SET THE HIDDEN INPUT VALUE TO THE NEW LAYER
	document.getElementById('currentLayerHolder').value = newLayer;
}