window.onload = function(){
	var selection = $$('li.cat > ul');
	for(var i = 0; i < selection.size(); i++){
		selection[i].hide();
	}
	selection = $$('li.cat');
	selection.each(function(item) {
		item.observe('click', dropdownmenu);
	});
}
function dropdownmenu(event) {
	var element = event.element();
	Effect.BlindDown(element.childElements()[1]);
	element.childElements()[0].writeAttribute("src", "gfx/downarrow.png");
	Event.stopObserving(element, 'click', dropdownmenu);
	element.observe('click', pullupmenu);
}
function pullupmenu(event) {
	var element = event.element();
	Effect.BlindUp(element.childElements()[1]);
	element.childElements()[0].writeAttribute("src", "gfx/rightarrow.png");
	Event.stopObserving(element, 'click', pullupmenu);
	element.observe('click', dropdownmenu);
}