Flowchart webcontrol

Hello,

We want to enable our customers to create their own flowchart on our
website.

How could we do this, without reinventing the wheel.

I imagine this in some kind of ajax or flash-control controled by the
server for storing and serving the data.

Is there any good control on the market? I did not find any nice ones.

I hope someone can help me on that!

Thank you!

Regards,
Uwe