Please help me out...

On a network share I have pictures of employees. Name of picture is "<employeenumber>.gif".
In Access I have a table containing employeenumber, full name etc.

I like to have a query verify if every employee has it's own picture (why? Because it is used on an intranet). The output should contain the employeenumber and full name of persons without a picture.

Now I tried something with:
test: Len(([Dir$](('O:\picture\') & [employeenumber] & ('.gif')))).
where "O:\picture" is the share on the network which contains the images and "employeenumber" is a field in a table.
But this isn't working.

What am I doing wrong?