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) {
		b_home_over = newImage("uploads/images/b_home-over.gif");
		b_home_down = newImage("uploads/images/b_home-down.gif");
		b_programme_over = newImage("uploads/images/b_programme-over.gif");
		b_speakers_over = newImage("uploads/images/b_speakers-over.gif");
		b_whoshould_over = newImage("uploads/images/b_whoshould-over.gif");
		b_practical_over = newImage("uploads/images/b_practical-over.gif");
		b_aboutciaa_over = newImage("uploads/images/b_aboutciaa-over.gif");
		b_registration_over = newImage("uploads/images/b_registration-over.gif");
		b_contact_over = newImage("uploads/images/b_contact-over.gif");
		preloadFlag = true;
	}
}