function attachRollOver() {
	// Find the source of big images
	var bigImageAnchors = $('collectionTeaser').getElementsByTagName('a');
	
	// Attach rollover actions
	var menuAnchors = $('menuCollections').getElementsByTagName('a');
	for (var i = 0; i < menuAnchors.length; i++) {
		menuAnchors[i].onmouseover = function() {
			for (var j = 0; j < bigImageAnchors.length; j++) {
				if (bigImageAnchors[j].href == this.href) {
					bigImageAnchors[j].className = 'show';
				} else {
					bigImageAnchors[j].className = 'hide';
				}
			}
		}
	}
}

addLoadEvent(attachRollOver);