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) {
        nrg_nav_06_nrg_nav_07_over = newImage("images/nrg_nav_06-nrg_nav_07_over.gif");
		nrg_nav_07_nrg_nav_08_over = newImage("images/nrg_nav_07-nrg_nav_08_over.gif");
		nrg_nav_08_nrg_nav_09_over = newImage("images/nrg_nav_08-nrg_nav_09_over.gif");
		nrg_nav_09_nrg_nav_10_over = newImage("images/nrg_nav_09-nrg_nav_10_over.gif");
        nrg_nav_10_nrg_nav_11_over = newImage("images/nrg_nav_10-nrg_nav_11_over.gif");
        nrg_nav_11_nrg_nav_12_over = newImage("images/nrg_nav_11-nrg_nav_12_over.gif");
        nrg_nav_12_nrg_nav_14_over = newImage("images/nrg_nav_12-nrg_nav_14_over.gif");
        nrg_nav_14_nrg_nav_15_over = newImage("images/nrg_nav_14-nrg_nav_15_over.gif");
        nrg_nav_15_nrg_nav_16_over = newImage("images/nrg_nav_15-nrg_nav_16_over.gif");
        nrg_nav_16_nrg_nav_17_over = newImage("images/nrg_nav_16-nrg_nav_17_over.gif");
		nrg_nav_17_nrg_nav_18_over = newImage("images/nrg_nav_17-nrg_nav_18_over.gif");
		nrg_nav_18_over = newImage("images/nrg_nav_19-over.gif");

		preloadFlag = true;
	}
}