Style sheete issue

Question

I'm having a small issue with div tags in on my jsp. Has anyone seen this or can anyone tell me what is wrong.
I just have two div tags in my style sheet as follows.
.OmniIframeWrapper
     background-color:#F2F0E6;          
     width:98%;
     overflow:auto;
     border:1px solid black;
.OmniIframeContent
     background-color:#F2F0E6;
     width:100%;
     margin:5px;
     padding: 5px;
}then I nest those on my jsp to create a scrolling area for my data. In IE this works just fine. But in firefox the bottom scrollbar is always on. Even if the content of the inner div tag is only an empty table.
<DIV class="OmniIframeWrapper" style="height: 450">
          <DIV class="OmniIframeContent"><table><tr><td>test data</td></tr></table></DIV>
          </DIV>

Answer 1

I've change the size of the inner div tag to 99% instead of 100% . This does fix the problem.. but I don't like the fact that FF handles it the way it does.