function show_menu(show_id, hide_class){
	
	menu_items = document.getElementsByTagName("div");
	
	for(i=0; i<menu_items.length; i++){
		
		if(menu_items[i].className==hide_class){
			menu_items[i].style.display = "none";
		}
		
	}
	
	document.getElementById(show_id).style.display = "block";
	return false;
}

function hide_menu(hide_class){
	
	menu_items = document.getElementsByTagName("div");
	
	for(i=0; i<menu_items.length; i++){
		
		if(menu_items[i].className==hide_class){
			menu_items[i].style.display = "none";
		}
		
	}
	
	return false;
	
}