I want to upload a few banners formatted on html. But my website BookEnterprise.com does not accept html, and accepts only gif and jpeg format. Each time, I try to upload a pricutre from my computer files on to my website, the editor installed on the website prompts me 'html format is invalid'.
How can I (a) convert the file from html to gif or jpeg? Or
(b) disable the editor?

This website was custom designed, and the designer is not cooperative.

Look forward to receiving your advice.

Best regards,
Prem Bhandari

You own this website? If so, you should have FTP access to upload pages with modified HTML.