payment button broken?

[domifry]

Hello,

if you go to my shop:
XXX (domain deleted)
you can put a product in the basket case (under the card: "in den warenkorb")
If you click than on the payment method site (Zahlungart ändern / Eingaben korrigieren)
You can choose a method but if you click on (speichern) it do not redirect you back to the page. But i you click on save (speichern) and reset (stornieren) it leads you back to step four. So the saving process work but the redirect is broken. Can you help me with this?

I changed the redirect action url in Virtuemart.
When i change it:
it doesnt save the value anymore but it redirect me.

Maybe i can implement a file which save my payment value and redirect me after?
Do you know how to add to a form: do something after submit? i tried onsubmit=redirect function but it doesnt work.
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