var shown_element = null;
	var selected_link = null;
	
	function init_shown_image(div_id, link_id) {
		shown_element = document.getElementById(div_id);
		selected_link = document.getElementById(link_id);
	}
	
	function show_image(div_id, link) {
		if (shown_element != null) {
			shown_element.style.display = "none";
		}
		if (selected_link != null) {
			selected_link.className = "";
		}
		Effect.Appear(div_id);
		shown_element = document.getElementById(div_id);
		selected_link = link;
		selected_link.className = "selected_link";
	}