print l(t()) not working in drupal 6?

Hi!
I'm upgrading a theme of mine from 5 to drupal 6 but I just stumbled over a pretty annoying problem.
I have this code in my node.tpl.php but it wont work in drupal 6. I get this error:

Fatal error: Unsupported operand types in localhost\sitename\includes\common.inc on line 1445

Code:

print l(t('Read full content') , 'node/'. $node->nid ,NULL, NULL, NULL, NULL, TRUE);

Could anyone point me in the right direction?