<IMG ...>STARTSTART = FILEOPEN
FILEOPEN, which is the default value, makes the movie start when the file is opened.
For example, this code
<IMG SRC="../graphics/moonflag.gif" DYNSRC="../graphics/moonflag.mpg" START=FILEOPEN ALT="Astronauts on the moon">
starts the movie as soon as the page is opened:
START=MOUSEOVER >>>