Do you use Opera? Of course the bubble should be closed by clicking once on the [x]. The ondblclick event on the whole div container is just for a faster way to close it without targeting. But in Opera the link handle seems to be hidden by the div container. Even z-index didn't help. Any ideas?

I'm using IE6 SP2, SeaMonkey 1.1.1 (working), and mainly Mozilla 1.7.1 (not working).
No ideas yet, but I will give it a try later (I'll be back on 01 April).