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+=2) {
				document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
			}
		}
	}
	
	var preloadFlag = false;
	function preloadImages() {
		if (document.images) {
			map_Auckland = newImage("images/map_Auckland.gif");
			map_Blenheim = newImage("images/map_Blenheim.gif");
			map_BOP = newImage("images/map_BOP.gif");
			map_Cntrbry = newImage("images/map_Cntrbry.gif");
			map_CntrlOtago = newImage("images/map_CntrlOtago.gif");
			map_Gisborne = newImage("images/map_Gisborne.gif");
			map_HawkesBay = newImage("images/map_HawkesBay.gif");
			map_Manawatu = newImage("images/map_Manawatu.gif");
			map_Nelson = newImage("images/map_Nelson.gif");
			map_NrthHrbr = newImage("images/map_NrthHrbr.gif");
			map_NrthLand = newImage("images/map_NrthLand.gif");
			map_Otago = newImage("images/map_Otago.gif");
			map_SouthCntrbry = newImage("images/map_SouthCntrbry.gif");
			map_Southland = newImage("images/map_Southland.gif");
			map_Taranaki = newImage("images/map_Taranaki.gif");
			map_Waikato = newImage("images/map_Waikato.gif");
			map_Wairarapa = newImage("images/map_Wairarapa.gif");
			map_Wellington = newImage("images/map_Wellington.gif");
			map_Westland = newImage("images/map_Westland.gif");
			preloadFlag = true;
		}
	}