function rollover(img_name, src_name) {
	img_name.src = src_name;
}	

function nextProduct(offProd, onProd) {
	//turn off current prod
	styleChange(offProd, 'none');

	//turn off next prod
	styleChange(onProd, 'block');
}

function styleChange(element, display) {
	element.style.display = display;
}