$(selector).realshadow(); // options are optional

$(selector).realshadow({

    followMouse: false,   // true by default

    pageX:       x,       // x coordinate of the light source
    pageY:       y        // y coordinate of the light source

    c: {                  // shadow color
        r: 1,             // red   channel for shadow
        g: 1,             // green channel for shadow
        b: 1,             // blue  channel for shadow
    }

});