You have to clear the floating elements in #home_whole.
A quick'n'dirty solution would be to add a clear-div in your container:
<div id="home_whole">
<div class="cellOne"> [...] </div>
<div class="cellTwo_imageitem cellTwo"> [...] </div>
<div style="clear: both"></div>
</div>
Another solution is the
CSS clearfix.
After adding this to your CSS, you simply add the class "clearfix" to #home_whole to clear the contained floats.
<div id="home_whole" class="clearfix"> [...] </div>
