Disable Add Another Item button option

Sub
This seems to be what I'm looking for, but for D6 : )
I need to attach only one pic node to a description node. But only one, so I need to deactivate the Add link in the description node after the pic node is sent and approved.
I've been struggling all morning trying to do it via if/else modification in the node-description.tpl template. WSOD is all I get -- I'm not a coder...

Warm regards from sunny México!
: )
José

I don't understand this request. Node Reference URL Widget doesn't work with multiple values at all in either D6 or D7. See #428988: Multiple reference handling.

Sorry, Nathan. My bad.

I now know that my support request doesn't belong to this thread.

I was just trying to put the "add another..." link on a different place of my node, and I did it with this little snippet of code:

<?php
print nodereference_url_create_link($node, 'field_nodereference_toparentcontenttype', 'childcontenttype');
?>

I should have returned here before...

@PepeMty: Ah, yeah that's different than @vasike's suggestion above. Thanks for the followup.