For Lucky

function onScriptLoad() {
    AddClass(1, RGB( 255,255,255 ), 0, Vector(0,0,0), 0, 0,0,0,0,0,0);
    //Do it yourself, but remember only one class should be there.
    Left_arrow < - //Your bindkey shit
        Right_arrow < - //another :D
}

dick <- array( 2 ); //2 is the number of worlds/gamemodes.
dick[0] = [ 0, 1, 2, 3 ]; //The skins you want.
dick[1] = [ 4, 5, 6 ]; //Again, the skins you want.

Iterator <- 0;

function onKeyDown(player, key) {

    switch (key) {

        case Left_arrow:
            if (player.IsSpawned) return;
            if (Iterator <= 0) Iterator = dick[player.World - 1].len();
            Iterator--;
            player.Skin = dick[player.World - 1][Iterator];
            break;

        case Right_arrow:
            if (player.IsSpawned) return;
            if (Iterator > dick[player.World - 1].len()) Iterator = 0;
            Iterator++;
            player.Skin = dick[player.World - 1][Iterator];
            break;

    }
}