the site you went to and submitted successfully is on a test server...that has worked fine from day one
its the form on the live domain that is not working as it should. As have said, on that the form does nto submit, nor does it redirect but it is exactly the same as the one on the test server so cannot fathom why it isnt working (and have reuploaded all the files a couple of times) :S
Have added your ip so you can now view the page on the live domain on the link in the PM
EDIT. have also added a DW ste file should you want/need access to the files on the live server