Filling in an online form

I have some jpeg images that I need to include on an application form. I press BROWSE on their form, next to the appropriate window for loading an image. Then I select the image that I want to load on to the form, form my desktop. When I go to submit the completed application form, the images are not sent. Any clues as to what to do?

Other than contacting them, no ideas. Or, send a separate e-mail with the files attached.