As a quick test I added this HTML to a test page: <OBJECT data="error.wav" WIDTH="1" HEIGHT="1" TYPE="audio/x-wav"></OBJECT> When I loaded the page in Firefox (3.0.3, PC), I was prompted to install a missing plugin (Quicktime). When I loaded the page in Internet Explorer (6, PC and 7, VirtualPC) I was told that Internet Explorer had blocked the site from using ActiveX in an unsafe manner. I'm not offered a way to enable it. Only Opera played the wav file successfully. When I tried it with an OGG file, Firefox again wanted me to install Quicktime. Internet Explorer 6 and 7 prompted me to attempt to play the file by launching the Windows Media Player application (which of course failed to play the file). Opera didn't play the file and didn't produce any errors or warnings. Can anyone share some HTML+media that test more successfully? -- Owen