...in Nokia N80 browser.

My html web page has line:
<embed><src="test.mp4" height="250" width="540" type="video/mp4"></embed>

After opening web page in phone S60 browser I can hear only the sound of test.mp4 file but I can't see any video stream.
The question is: how html code should look like to open RealPlayer window and display video content in browser? Or maybe there is a problem with configuration of the phone?