The best way to do this stuff is to use Firefox with its Web Developer Toolkit and Firebug add-ons. However, an alternative is to use View Source to find out which class is being applied to the relevant sections... so for the centerbox you find:
Code:
class="centerBoxWrapper" id="whatsNew"
and for the sidebox you
Code:
class="rightBoxContainer" id="whatsnew"
Note the difference in the IDs - minor but vital!
If I may make a small observation re your design...I think that fixed background is going to give people a headache.
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