var preloadFlag = false;
var nationsImgArr = new Array(
		"images/regional_maps/nations/rmapsNations_01-Scotland1_o.gif",
		"images/regional_maps/nations/rmapsNations_01-Wales1_over.gif",
		"images/regional_maps/nations/rmapsNations_01-NIreland1_o.gif",
		"images/regional_maps/nations/rmapsNations_01-England1_ov.gif");
var regionsImgArr = new Array(
		"images/rmapsRegions_01-SouthEast1_.gif",
		"images/rmapsRegions_01-SouthWest1_.gif",
		"images/rmapsRegions_01-Scotland1_o.gif",
		"images/rmapsRegions_01-Wales1_over.gif",
		"images/rmapsRegions_01-NIreland1_o.gif",
		"images/rmapsRegions_01-Humber1_ove.gif",
		"images/rmapsRegions_01-EastMidland.gif",
		"images/rmapsRegions_01-NorthEast1_.gif",
		"images/rmapsRegions_01-NorthWest1_.gif",
		"images/rmapsRegions_01-EastEngland.gif",
		"images/rmapsRegions_01-WestMidland.gif",
		"images/rmapsRegions_01-London1_ove.gif");
		
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];
		}
	}
}

function preloadMapImages(imgArr) {
	if (document.images) {
		for (i = 0 ; i < imgArr.length ; i++){
			loadImg = newImage(imgArr[i]);
		}
		preloadFlag = true;
	}
}