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) {
		home_act_off = newImage("/images/btn-home-act-off.gif");
		home_act_over = newImage("/images/btn-home-act-over.gif");
		home_non_off = newImage("/images/btn-home-non-off.gif");
		home_non_over = newImage("/images/btn-home-non-over.gif");
		purpose_act_off = newImage("/images/btn-purpose-act-off.gif");
		purpose_act_over = newImage("/images/btn-purpose-act-over.gif");
		purpose_non_off = newImage("/images/btn-purpose-non-off.gif");
		purpose_non_over = newImage("/images/btn-purpose-non-over.gif");
		services_act_off = newImage("/images/btn-services-act-off.gif");
		services_act_over = newImage("/images/btn-services-act-over.gif");
		services_non_off = newImage("/images/btn-services-non-off.gif");
		services_non_over = newImage("/images/btn-services-non-over.gif");
		faqs_act_off = newImage("/images/btn-faqs-act-off.gif");
		faqs_act_over = newImage("/images/btn-faqs-act-over.gif");
		faqs_non_off = newImage("/images/btn-faqs-non-off.gif");
		faqs_non_over = newImage("/images/btn-faqs-non-over.gif");
		contact_act_off = newImage("/images/btn-contact-act-off.gif");
		contact_act_over = newImage("/images/btn-contact-act-over.gif");
		contact_non_off = newImage("/images/btn-contact-non-off.gif");
		contact_non_over = newImage("/images/btn-contact-non-over.gif");
		reviews_act_off = newImage("/images/btn-reviews-act-off.gif");
		reviews_act_over = newImage("/images/btn-reviews-act-over.gif");
		reviews_non_off = newImage("/images/btn-reviews-non-off.gif");
		reviews_non_over = newImage("/images/btn-reviews-non-over.gif");						
		preloadFlag = true;
	}
}