var current_id="news";

function showItem(id) {
	var prev_obj = document.getElementById("item_"+current_id);
	var obj = document.getElementById("item_"+id);
	if (prev_obj) {
		prev_obj.style.display = "none";
        document.getElementById("tab_"+current_id).className = "unselected";
	}
	if (obj) {
		obj.style.display = "block";
		current_id = id;
	}
	document.getElementById("tab_"+id).className = "selected";
}