rollover not working in Mozilla

[liunx]

I have designed my brothers businesses website <!-- w --><a class="postlink" href="http://www.rollingtank.com">www.rollingtank.com</a><!-- w --> (<!-- m --><a class="postlink" href="http://www.rollingtank.com/">http://www.rollingtank.com/</a><!-- m -->). The navigation is at the top and at the left. The left buttons are working fine, but the top ones do not appear in Mozilla and possibly other browsers too. I used the same method for both, could someone please tell me how I have to modify my css to get them to work?Is this Mozilla or are you including Mozilla Firefox? In Firefox, it works perfectly fine for me.sorry fellas, i meant firefox but d/w i fixed the problem. thanx for your time checking it anyway