Will this script work with xTemplate?

I have the taxonomy image module working.
What I am struggling with is, how do I get the taxonomy image patch to only appear once per page. I tried going directly to my .xtmpl file and pasting....

taxonomy_image_display($term->tid)
or

<?= taxonomy_image_display($term->tid) ?>
or

none seemed to work. So can I process php directly in a .xtmple file?

I also referred to a patch submitted at http://jony.net/node/21, that seemed to edit the xtemplate.engine to get the image files to appear. Though they started showing up for each node. I was shooting more for a different logo image or a different header image per term.

Any suggestions are welcome!

Jim