How do I center (vertically and horizontally) buttons in a div tag?

Set the items inside your div like so:

margin: 0px auto 0px auto; text-align: center;

<div class="listBoxMoverUserControl_column1" style="margin: 0px auto 0px auto; text-align: center;">

** I just did an inline example to show you what I meant.

set the margins around the object to take up the rest of the space. If you want to center a 50px by 50px div in a 100px by 100px div, then you will set a margin of 25px around the 50px div.