I may add that the future. For now, I'd recommend modifying the store_main.tpl.php to change the alt attribute. In the default store_main.tpl.php template the line looks like this:
PHP Code:
<img src="<?php print $Logo_Image['dyn'] ?>" alt="<?php print $Logo_Image['alt'] ?>" width="<?php print $Logo_Image['width'] ?>" height="<?php print $Logo_Image['height'] ?>" />
Just change to:
PHP Code:
<img src="<?php print $Logo_Image['dyn'] ?>" alt="Manzanita Lab; Fossils and stuff from around the world" width="<?php print $Logo_Image['width'] ?>" height="<?php print $Logo_Image['height'] ?>" />