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**RichardGv** · (This post was last modified: 08-06-2010, 11:07 AM by RichardGv.)

There are several ways to achieve the effect, I believe:

A hidden < audio > tag will probably work, but since it's a HTML5 tag, the cross-browser compatibility is not so great right now.

Code:
IE 6/7/8 No support Firefox 3.5.x - 3.6.x wav, ogg Safari "Safari on the desktop supports any media the installed version of QuickTime can play", they said, thus H.264, MP3, AAC, and WAV should work, but ogg may not work. Chromium/Chrome ogg, wav, mp3, aac Opera ogg, wav (On Linux, Opera supports the formats GStreamer does)
The detailed methods can be found on Google, or some links given here:
http://net.tutsplus.com/tutorials/html-c...o-element/
http://dev.opera.com/articles/view/every...and-audio/
http://developer.apple.com/safari/librar...asics.html
Flash. It works on most cases, provided that the user did not intentionally block Flash, and does have Flash installed. There are a lot of Flash audio players available, for instance: (Keep in mind that I cannot guarantee these things are safe!)
http://www.longtailvideo.com/players/jw-flv-player/
http://musicplayer.sourceforge.net/
http://flowplayer.org/
(And you can hide a Flash player easily.)
There are also cases of video relying on other plugins, e.g. Windows Media Plugin. Of course, this is usually a bad idea.

Last but not least, it's usually not a good idea to play audio automatically on a webpage without a way to let user stop it manually. :) And playing music in the background is annoying in viewpoints of some people, like me.