RGB LED, random colour generator not working

hello all,
                new both forum , arduino in general. have tried out many different sketches rgb led randomly choose , stay on colour each time button pressed. instead continuously cycles through different colours pausing briefly when button pushed. hope can me, project due next week , lost.

// variables assign outputs each color
const int ledredpin = 10;
const int ledgreenpin = 9;
const int ledbluepin = 8;
// variable assign pin button
const int buttonpin = 2;

// variables control intensity of each color
int red;
int green;
int blue;

// variable state of button (high or low)
int butstate;

void setup () {
  pinmode (ledredpin, output);
  pinmode (ledgreenpin, output);
  pinmode (ledbluepin, output);
  pinmode (buttonpin, input);

  // initialize colours
  red = random(256);
  green = random(256);
  blue = random (256);
}

void loop() {
  // output led
  digitalwrite (ledredpin, red);
  digitalwrite (ledgreenpin, green);
  digitalwrite (ledbluepin, blue);

  butstate = digitalread (buttonpin);
  // change colour values
  if (butstate == high) {
    //randomseed();
    red = random(256);
    green = random(256);
    blue = random (256);
  }
}

make sure button wired low resistor ground (not floating), , button need debounced, or able prevent being held down.

you can fill in rest , make currstate, laststate boolean @ top of sketch.

code: [select]

currstate = digitalread( 2 );
if( currstate != laststate)
{
  laststate = currstate;
  if(currstate == high)
  {
    // colors here
  }
}

tip, if know variables not going exceed  (-32,768 32,767) = int or (0 65,535) = unsigned int, can make them byte save memory. oh , analogwrite, not digital.

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