I have a script that does a few things, and upon completion i need it to add an expression the the position of a layer in a comp. the expression is saves on its own in a .js file and the script is supposed to load it. this isnt' working at all the way i expect it to. here's what i have now. any help...

So i have a somewhat lengthy expression that will be applied to all transform properties of all layers in a project. i would like to be able to easily update this expression and have that update ripple through all elements using it. my question is: is there a way to dynamically copy the expression o...