It took too long to find this answer on google, and it took too long trying to solve this issue using all the different methods from my 'bag of designer tricks'.
What I am trying to do in a nutshell - Make a submit button image align / anchor to the bottom of the line so it aligns correctly with the input field beside it. The two element naturally displayed together like this-- The input box's valign was to the bottom, and the submit button image was to the top. Seems dumb, I know.
WHAT I GOT

I am not going to explain the long list of css and html positioning tactics I tried to make the image anchor to the bottom. Because I tried allot. Here the simple solution...
Within your submit image code, which looks like this:
Make your similar code, look like this:
Thats all! align="absmiddle" . I have never even heard of an absmiddle until now...
Here is some additional information on the attribute:
"ALIGN=absmiddle - Aligns the middle of the current line with the middle of the image. " : )
"ALIGN=absbottom - Aligns the bottom of the image with the bottom of the current line."
Happy Adventure,
Hudson