Overidding title

I was just wondering if there is a way to override the title that gets built into the URL without manipulating the module itself? I need to change $title = urlencode($node->title) to $title = urlencode($node->display_title) that is in:

function service_links_render($node, $nodelink = FALSE)

This is D5, so my guess is no.

Thanks in advance for your help.