Why are Producer presentations on Web Site Appear Tiny

I create an audio-only narrated presentation in Mirosoft Producer. The
finished product when viewed on my hard drive appears perfect. I then follow
detailed instruction on FTPing the htm page and the associated _files
directory to my web page. When viewed over the internet, we get the graphics
skin for the audio and no playback buttons of page listings and the
presentation itself is squeezed so small that you cannot read any of the text
on the presentation.

Has anyone else had this problem and, if so, how did they resolve it?