Forgive me if i'm wrong, but I think everybody missed a little thing that could help you the next time:

When you do:
@IDnumber=@row1;
inside a loop.

The value of @IDnumber will ALWAYS be the last item of the loop.

So what you need to do, is to ADD an item to @IDnumber, or %IDnumber (using push array,var; should work fine).

my 2 cents