Valign form in table

I have a small one line form with a dropdown list and a submit button that I have in a cell of a table. I want the form to be valigned to the middle of the table. For some reason valign isn’t having any effect on the form. Using CSS and padding the top of the form to push it down also ads to the height of the table so it doesn’t really light up right. Does anyone have any advice on how to fix this?