The Color Steps don't work?

[Ants-double]

I Changed the color code .but it will work show a Single Color.
var guiControls = new function () {
this.model = 'bonsai';
this.steps = 256.0;
this.alphaCorrection = 1;
this.color1 = "#000000";
this.stepPos1 = 0.0;
this.color2 = "#ff0077";
this.stepPos2 = 0.22;
this.color3 = "#3f7210";
this.stepPos3 = 0.3;
//this.color4 = "#FFFAFA";
//this.stepPos4 = 0.65;
//this.color5 = "#FF1493";
//this.stepPos5 = 0.85;
//this.color6 = "#FFff00";
//this.stepPos6 = 1.0;

};