Hi
Ok. It's really hard to help exacly. I would have done it differently. I would attache background to <li></li> element not under the full menu like You did, than separator to <a></a> element inside. This way You will be able to manipulate borders below each <li></li>. I would help and make it for You, but it was modificated so I have nothing I can try any code on. Try my tip and if it will not help send me ftp access.