Basically, the situation is this:

Let's say I'm a typist working on a proposal letter.  I need to insert a
signature in the document.  

Now we had a system in 2000 where there was a secondary document with 6
signatures (image files) and we could choose one of those from the document
we were typing.  It all worked great.

Until Word 2003.  Now I need to devise another way to do this, and I'm at a
loss.  Picking between one of 6 buttons for each signature isn't an option, I
need them all to be selectable from a drop-down tab.

Any idea on how to accomplish this?