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) {
		rrMap2_01_AZ_over = newImage("images/rrMap2_01-AZ_over.gif");
		rrMap2_01_LA_over = newImage("images/rrMap2_01-LA_over.gif");
		rrMap2_01_DC_over = newImage("images/rrMap2_01-DC_over.gif");
		rrMap2_01_CHI_over = newImage("images/rrMap2_01-CHI_over.gif");
		rrMap2_01_OCCA_over = newImage("images/rrMap2_01-OCCA_over.gif");
		rrMap2_01_NCA_over = newImage("images/rrMap2_01-NCA_over.gif");
		rrMap2_01_National_over = newImage("images/rrMap2_01-National_over.gif");
		rrMap2_01_SLC_over = newImage("images/rrMap2_01-SLC_over.gif");
		preloadFlag = true;
	}
}