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) {
		gbmenu_nav01 = newImage("../images/navigatie/nav1b.gif");
		gbmenu_nav02 = newImage("../images/navigatie/nav2b.gif");
		gbmenu_nav03 = newImage("../images/navigatie/nav3b.gif");
		gbmenu_nav04 = newImage("../images/navigatie/nav4b.gif");
		gbmenu_nav05 = newImage("../images/navigatie/nav5b.gif");
		gbmenu_nav06 = newImage("../images/navigatie/nav6b.gif");
		gbmenu_nav07 = newImage("../images/navigatie/nav7b.gif");
		gbmenu_nav08 = newImage("../images/navigatie/nav8b.gif");
		
		preloadFlag = true;
	}
}