Global fill color change

Is there a way to have the color change in a field for all fields on a form on entry and exit without having to code a hundred fields individually.

Example:

On enter: this.fillColor = "164,222,171";

On exit: this.fillColor = "250,250,250";

I want all the fields on the form to do this, but with over 50 fields it seems very time consuming.

Thanks.