Can't get video to work

I followed tutorials at Adobe, Lynda.com and Stackoverflow but can't get my video to work in my Edge Animate presentation.

Here is the code I used. "holder" refers to a rectangle on stage. I put the code into a timeline trigger as per the tutorial.

var vid=sym.$("holder");

vid.html=('<video width="300" height="200" src="shortclips/one.mp4" poster="images/alpha20.jpg" type="video/mp4" controls ="controls"></video>');

I copied the HTML5 code straight into a Dreamweaver page, and the video worked fine as did the poster frame.

Any help appreciated.