source text set value at time

Hey,

I am a begginer at AE scripting. I'd like to change text color over time. I have already done this with f.e. scale property. I'd like to do the same with color. So until now Ive changed the color once:

    //CHANGING SOURCE TEXT PROPERTIES {{{

        var compSourceText = comp.layer(1).property("Source Text");

        var compTextValue = compSourceText.value;

        compTextValue.fillColor = [1,  0,  0];

        compSourceText.setValue(compTextValue);   

    // }}}  

How can I change it at given time? Like here:

var compScaleProperty = comp.layer(1).property("Scale");

        compScaleProperty.setValueAtTime(5, [360, 360]);

        compScaleProperty.setValueAtTime(5.4,  [370, 370]);

        compScaleProperty.setValueAtTime(5.8,  [380, 380]);

        compScaleProperty.setValueAtTime(6.2,  [400, 400]);

        compScaleProperty.setValueAtTime(6.6,  [420, 420]);

        compScaleProperty.setValueAtTime(7,  [440, 440]);

I'd be very grateful for any help