Change color to hex values in javascript

Hi there,

I am using this script within my custom keystroke script:

// Custom Keystroke script for dropdown

(function () {

    if (!event.willCommit) {

        exp_val = event.changeEx;

        // Get a reference to the text field

        var f = getField("DD39");

        // Set the stroke color of the text field based on the dropdown selection

        switch (exp_val) {

        case "0" :

            f.fillColor = color.green;

            break;

        case "1" :

            f.fillColor = color.blue;

            break;

        case "2" :

            f.fillColor = color.yellow;

            break;

        case "3" :

            f.fillColor = color.red;

            break;

        default :

            f.fillColor = color.white;

            break;

        }

    }

})();

However I would really like to use custom color values, rather than the defaults. What is the syntax? I've tried a few things but nothing works.

Thanks

Amanda