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) {
		menu_home_over = newImage("images/nav_home_on.gif");
		menu_location_over = newImage("images/nav_location_on.gif");
		menu_about_over = newImage("images/nav_about_on.gif");
		menu_leed_over = newImage("images/nav_leed_on.gif");
		menu_dryvit_over = newImage("images/nav_dryvit_on.gif");
		menu_quickrete_over = newImage("images/nav_quickrete_on.gif");
		menu_glasroc_over = newImage("images/nav_glasroc_on.gif");

		menu_home_default = newImage("images/nav_home_off.gif");
		menu_location_default = newImage("images/nav_location_off.gif");
		menu_about_default = newImage("images/nav_about_off.gif");
		menu_leed_default = newImage("images/nav_leed_off.gif");
		menu_dryvit_default = newImage("images/nav_dryvit_off.gif");
		menu_quickrete_default = newImage("images/nav_quickrete_off.gif");
		menu_glasroc_default = newImage("images/nav_glasroc_off.gif");


		preloadFlag = true;
	}
}