Advance flash via javascript

Answer 1

You should check the ExternalInterface class. See the docs

The ExternalInterface class allows for a two way communication between AS3 & JS.

Answer 2

Try:

var player1 = document.getElementById("myFlashMov");
player1.Play();

The capital P should do the trick. It works for me.

Edit:

You may also need to put the <param name="allowScriptAccess" value="sameDomain"/> tag inside your object-tag. I am not sure that this is needed, but it doesn't hurt