Thank you for your reply and yes you were right about uploading the whole webassist folder.
It seems like dreamweaver didn't upload all the files even when I saved all and klicked YES when it gave me the option to upload all the files related to it, which I always do with my other pages when I upload files.
So instead I used F8 in Dreamweaver and selected the whole webassist folder on my local computer and then upload.
Now it works fine, the same page was found and I also received the form in my e-mail box.
Thanks again for your fast reply, now I can start to build a new bigger form with Webassist.