function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=3) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
			ShowLayer(changeImages.arguments[i+2]);
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		nav001 = newImage("assets/images/ausmap_act.gif");
		nav002 = newImage("assets/images/ausmap_nsw.gif");
		nav003 = newImage("assets/images/ausmap_vic.gif");
		nav004 = newImage("assets/images/ausmap_qld.gif");
		nav005 = newImage("assets/images/ausmap_nt.gif");
		nav006 = newImage("assets/images/ausmap_sa.gif");
		nav007 = newImage("assets/images/ausmap_wa.gif");
		nav008 = newImage("assets/images/ausmap_tas.gif");
		preloadFlag = true;
	}
}

var active ='init'; 
function ShowLayer(id) { 
	if (document.all) { document.all[active].style.visibility = "hidden"; } 
	if(document.layers){ document.layers[active].visibility = "hide";} 
	if(document.getElementById) {document.getElementById(active).style.visibility='hidden';} 
	active = id; 
	if (document.all) { document.all[active].style.visibility = "visible";} 
	if(document.layers) { document.layers[active].visibility = "show" ;} 
	if(document.getElementById) {document.getElementById(active).style.visibility='visible';} 
}