You would have to modify the showgallery.tmpl template (lined 36-58) to suit your specific needs.
http://www.photopostdev.com is a community supported mod forum that might be able to help if you aren't sure what to do.
You'll need to add some conditional around lined 53-56, probably something like:
if ( $takevotes == 1 ) {
echo<<<PPPRINT
...
PPPRINT;
}