I get a strange problem using the menu with one of your templates, the site is still under construction but you can see the problem here.
http://www.ullapoolaccommodation.com/links/8-ullapool.html the menu backgrounds dont appear on firefox or ie8.
When you look at it in ie8 i get this
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; WOW64; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; InfoPath.2; .NET CLR 1.1.4322; .NET CLR 3.5.30729; OfficeLiveConnector.1.4; OfficeLivePatch.1.3; .NET CLR 3.0.30729)
Timestamp: Wed, 2 Dec 2009 18:51:18 UTC
Message: '$$' is undefined
Line: 2
Char: 1
Code: 0
URI:
http://www.ullapoolaccommodation.com/modules/mod_s5_accordion_menu/js/s5_accordion_menu.js