As a control, the following line in my code works perfectly
var myTween = new TweenLite.to(photo, 1.5, {width:100, height:200, paused:true});
but when I change it to any of the following it doesn't work
var myTween = new TweenLite.to(photo, 1.5, {marginLeft:'200px', paused:true});
var myTween = new TweenLite.to(photo, 1.5, {marginLeft: 200, paused:true});
and the following kicks an error
var myTween = new TweenLite.to(photo, 1.5, {margin-left:'200px', paused:true});
var myTween = new TweenLite.to(photo, 1.5, {margin-left: 200, paused:true});