var selected_lan 	= 0;
	var cur_head 		= 1;
	
	setInterval ("head_switch()", 3000);

	function lan_select (lan_id)
	{
		if (lan_id != selected_lan)
		{
			if (selected_lan != 0)
			{
				dom_class ($('lan_' + selected_lan), 'on', false);
			}
			selected_lan = lan_id;
			if (selected_lan != 0)
				dom_class ($('lan_' + selected_lan), 'on', true);
			
		}
	}
	
	function lan_click (lan_id)
	{
		location='parks.xhtml?ss.lan_id=' + lan_id;
	}
	
	function school_click ()
	{
		location='downloads.xhtml?ss.lan_id=it&ss.park_id=1';
	}
	
	function head_switch ()
	{
		old_head = cur_head;
		cur_head ++;
		if (cur_head > 4)
			cur_head = 1;
			
	//	$('log').value += old_head + " -> " + cur_head + "\r\n";
			
		$('head' + old_head).zindex = 4;
		$('head' + cur_head).zindex = 5;

		
		
		new Effect.Opacity($('head' + cur_head), {duration:1, from:0, to:1});
		new Effect.Opacity($('head' + old_head), {duration:1, from:1, to:0});
	}