Change HTML export logo and help link

Hi

I want to change the logo when I use the HTML export and change the help link in the export too. I'm using Aris 9.8. I can change the logo in the images folder, but I don't want to do this every time I export. And I also want to change the help link, to point to a document I created, can I do this?

Hope any one can help

Regards

Diego