First, don't let all that weird PHP stuff in the file intimidate you

. Most Zencart PHP files, including that one, are well commented and each section is bracketed by
bof [name of section] and
eof [name of section]. b=beginning, e=end.
You'll need to find the section containing the code you want to move, and using your good text editor (I like Notepad++), cut that section and paste it where you want it. Save the file to your custom folder, and if it isn't right delete it and try again.
I'm intentionally not pointing out the exact sections you're looking for, since I think this is the kind of thing best learned by experience.
After you get the images where you want them, the alignment, etc. will be done in the stylesheet.