Help re:Centered Pop-Up Window tutorial

I have just done the centred pop up tutorial which works fine with one button and one animation popping up. but…
I want to make a main movie with three buttons instead of 1, that launch three different animations in the pop up windows. I put the code from the tutorial on all three buttons and changed the address section for each to load a different swf. It loads the same swf for each regardless - I have no idea why it doesn’t work.

Please could you explain to me how I should be doing this?
Thanks for your help!