Copy the file logo.php from the features folder of com_gantry (J!1.5) into the features folder of your template. Open that file and change the link ...
Hi, I have the same question (Where do I have to change the link of the logo which is set by default to the frontpage (index.php)) but I use HiveMind template (J!1.5) and I don`t see com_gantry in my components folder. Thanks
btw, the link is in the index.php of the template
find line 107
<a href="<?php echo $this->baseurl;?>" class="nounder"><img src="<?php echo $this->baseurl;?>/images/blank.png" border="0" alt="" id="logo" /></a>
and change that for your needs ...