I'd like to turn an image saved on my server into a button using PhP. I know it's easier to use HTML, but it's part of a Drupal module someone else wrote that I'm tinkering with and I'm no expert so I have to work with what I have. Any advice is certainly appreciated.

Here is the relevant line of code:

$content .= '<div class="biblio_export"> Export:['.l("Tagged","$base/export/tagged"). ']</div>';
I would like to replace the word "Tagged" with an image at location:


Thanks very much