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) {
		navigation_01_over = newImage("images/navigation_01-over.gif");
		navigation_02_over = newImage("images/navigation_02-over.gif");
		navigation_03_over = newImage("images/navigation_03-over.gif");
		navigation_04_over = newImage("images/navigation_04-over.gif");
		navigation_05_over = newImage("images/navigation_05-over.gif");
		navigation_06_over = newImage("images/navigation_06-over.gif");
		navigation_07_over = newImage("images/navigation_07-over.gif");
		navigation_08_navigation_07_over = newImage("images/navigation_08-navigation_07.gif");
		navigation_08_over = newImage("images/navigation_08-over.gif");
		navigation_09_over = newImage("images/navigation_09-over.gif");
		navigation_10_over = newImage("images/navigation_10-over.gif");
		navigation_11_over = newImage("images/navigation_11-over.gif");
		navigation_12_over = newImage("images/navigation_12-over.gif");
		navigation_13_over = newImage("images/navigation_13-over.gif");
		navigation_14_over = newImage("images/navigation_14-over.gif");
		navigation_15_over = newImage("images/navigation_15-over.gif");
		preloadFlag = true;
	}
}