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


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


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

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pre_aboutUs_on = newImage('images/menu/aboutUs_on.gif');
		pre_services_on = newImage('images/menu/services_on.gif');
		pre_products_on = newImage('images/menu/products_on.gif');
		pre_contactUs_on = newImage('images/menu/contactUs_on.gif');		
		preloadFlag = true;
	}
}