Use Paypal only if checked

Hello guys,

i am using this plugin and everything works fine while testing.
But now i only want to be forwarded to Paypal check-out if the user selects Paypal as a payment method through a radio-button or checkbox.
If the user doesnt select Paypal (instead selects second option), the form should be sent as usual. The user then will receive a regular bill that will be payed through normal bank transfer.

Thank ya’ll in advance!