HTML5 Canvas -Move mask using JavaScript?

[FlatChat]

I have two promitive oval shapes on a mask layer, 'mask_idn'.  How can I move that mask layer, or the shapes on that layer,  using JavaScript?  I can't seem to assign instance name to the shapes...

[FlatChat · Accepted solution]

Got it working with:

mask.x -= 1;

Which is the variable for the mask in the JS file.