function show_menu(which)
{
	var sub_menu = document.getElementById("sub_"+which);
	if(sub_menu)
	{
		sub_menu.style.display = "inline";
	}
	var menu_img = document.getElementById("menu_img_"+which);
	old_src = menu_img.src;
	var new_src = old_src.replace("_sel", "");
	if(new_src == old_src)
	{
		old_src = menu_img.src;
		var new_src = old_src.replace(".jpg", "_sel.jpg");
		menu_img.src = new_src;
	}
}

function hide_menu(which)
{
	var sub_menu = document.getElementById("sub_"+which);
	if(sub_menu)
	{
		sub_menu.style.display = "none";
	}
	var menu_img = document.getElementById("menu_img_"+which);
	old_src = menu_img.src;
	var new_src = old_src.replace("_sel", "");
	if(new_src != old_src)
	{
		menu_img.src = new_src;
	}
}

function show_sel(which)
{
	var sub_menu = document.getElementById(which);
	if(sub_menu)
	{
		var old_src = sub_menu.src;
		var new_src = old_src.replace(".gif", "_sel.gif");
		sub_menu.src = new_src;
			
	}
}

function unshow_sel(which)
{
	var sub_menu = document.getElementById(which);
	if(sub_menu)
	{
		var old_src = sub_menu.src;
		var new_src = old_src.replace("_sel.gif", ".gif");
		sub_menu.src = new_src;
			
	}
}