[Plugin: Image Widget] image dimentions

I have recently beed trying to optimize my blog with google page speed.
one of the errors that i am getting is related to the image dimensions that are set with Image Widget.

Apparently, google prefers to have html image dimensions, rather than just css, set for optimization.

Is there a easy way to modify the widget code to handle this?
Any insight (or hopefully code) would be appreciated!

Thanks in advance!