Event.observe(window, 'load', function() {
		var tabs = $('ss_tabs');
		
		$('ss_nav').observe('click', function(e) {
			var clicked_tab     = $(Event.findElement(e, 'li'));
			var clicked_tab_num = clicked_tab.id.split('_').last();
			var current_tab_num = tabs.className.split('_').last();
			
			if (clicked_tab_num != current_tab_num) {
				var current_tab     = $('ss_tab_' + current_tab_num);
				var current_tab_img = current_tab.down('img');
				current_tab_img.src = current_tab_img.getAttribute('src').gsub('on', 'off');					
				
				var clicked_tab_img = clicked_tab.down('img');
				clicked_tab_img.src = clicked_tab_img.getAttribute('src').gsub('off', 'on');
				
				tabs.className = 'active_' + clicked_tab_num;
			}
			
			Event.stop(e);
		});
	});