Problem with Sidebox Height

[gjh42]

You have this in your stylesheet:

.leftBoxContainer, .rightBoxContainer {
	margin: 0 0 22em 0;
}

You probably meant to use 2em .

Fixing that makes the top sidebox drop down on the page, so there is probably something else happening as well.
This is not the immediate cause, but might contribute:

#navColumnTwo{
    background-color: #f1e3c9;
	height: 100px;
}

Trying to specify the height of one table cell when they all have to be taller than this may cause problems.