// JavaScript Document
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImagesArray(array) {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<array.length; i+=2) {
			document[array[i]].src = array[i+1];
		}
	}
}

function changeImages() {
	changeImagesArray(changeImages.arguments);
}

function toggleImages() {
	for (var i=0; i<toggleImages.arguments.length; i+=2) {
		if (selected == toggleImages.arguments[i])      changeImagesArray(toggleImages.arguments[i+1]);
	}
}

var selected = '';
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		
		button_01_over 	= newImage("img/buttons/over_urban_interest_over.gif");
		button_02_over 	= newImage("img/buttons/personeel_over.gif");
		button_03_over 	= newImage("img/buttons/contact_over.gif");
		button_04_over 	= newImage("img/buttons/ontwikkeling_over.gif");
		button_05_over 	= newImage("img/buttons/beleggingen_over.gif");
		button_06_over 	= newImage("img/buttons/highlights_over.gif");
		button_07_over 	= newImage("img/buttons/sitemap_over.gif");
		button_08_over 	= newImage("img/buttons/terug_ro.gif");
		button_09_over 	= newImage("img/buttons/verder_ro.gif");
		
		preloadFlag 	= true;
	}
}