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) {
		navbottom_11_over = newImage("graphics/header_graphics/navbottom_11-over.jpg");
		navbottom_12_over = newImage("graphics/header_graphics/navbottom_12-over.jpg");
		navbottom_13_over = newImage("graphics/header_graphics/navbottom_13-over.jpg");
		navbottom_14_over = newImage("graphics/header_graphics/navbottom_14-over.jpg");
		navbottom_15_over = newImage("graphics/header_graphics/navbottom_15-over.jpg");
		navbottom_16_over = newImage("graphics/header_graphics/navbottom_16-over.jpg");
		navbottom_17_over = newImage("graphics/header_graphics/navbottom_17-over.jpg");
        navtop_04_over = newImage("graphics/header_graphics/navtop_04-over.jpg");
		preloadFlag = true;
	}
}