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.images[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) {
		home_portfolio_sel = newImage("ld_images/home-portfolio_sel.gif");
		home_over = newImage("ld_images/home-over.gif");
		home_down = newImage("ld_images/home-down.gif");
		home_sel = newImage("ld_images/home-sel.gif");
		home_overportfoliosel = newImage("ld_images/home-overportfoliosel.gif");
		home_downportfoliosel = newImage("ld_images/home-downportfoliosel.gif");
		portfolio_over = newImage("ld_images/portfolio-over.gif");
		portfolio_down = newImage("ld_images/portfolio-down.gif");
		portfolio_sel = newImage("ld_images/portfolio-sel.gif");
		portfolio_service_sel = newImage("ld_images/portfolio-service_sel.gif");
		portfolio_overservicesel = newImage("ld_images/portfolio-overservicesel.gif");
		portfolio_downservicesel = newImage("ld_images/portfolio-downservicesel.gif");
		service_portfolio_sel = newImage("ld_images/service-portfolio_sel.gif");
		service_over = newImage("ld_images/service-over.gif");
		service_down = newImage("ld_images/service-down.gif");
		service_sel = newImage("ld_images/service-sel.gif");
		service_contact_sel = newImage("ld_images/service-contact_sel.gif");
		service_overportfoliosel = newImage("ld_images/service-overportfoliosel.gif");
		service_overcontactsel = newImage("ld_images/service-overcontactsel.gif");
		service_downportfoliosel = newImage("ld_images/service-downportfoliosel.gif");
		service_downcontactsel = newImage("ld_images/service-downcontactsel.gif");
		contact_service_sel = newImage("ld_images/contact-service_sel.gif");
		contact_over = newImage("ld_images/contact-over.gif");
		contact_down = newImage("ld_images/contact-down.gif");
		contact_sel = newImage("ld_images/contact-sel.gif");
		contact_overservicesel = newImage("ld_images/contact-overservicesel.gif");
		contact_downservicesel = newImage("ld_images/contact-downservicesel.gif");
		preloadFlag = true;
	}
}