Thanks Frank!
Up till now i think solved the problem myself, well at least i think i did.
I read something on this forum about that you could setup your wifi settings with Ethernet and wifi dongle connected at the same time.
I tried with Ethernet, and it worked immediately. I then setup my settings for my wifi dongle with my laptop, clicked the save button.
Then i saw a popup saying that it takes some time setting up the network connection. I didn't get this with only the wifi dongle.
And now it works, and it says it's connected through ethernet, and wifi. Ofcourse i will disconnect the ethernet and keep you informed.
A quick heads up and edit:
It now works with Wifi dongle only!
I'm a happy man!