Jet pack

[Loveboy]

Hi guys i want to make jetpack but the problem is i can't :/ in a map with trigger i can.. but i want it to make it in a shop.
so if guy press F he will some fly, if press again he fly more.

script:

bounce( pos, power )
{
    oldhp = self.health;
    self.health = self.health + power;
    self finishPlayerDamage( self, self, power, 0, "MOD_PROJECTILE", "panzerschreck_mp", undefined, pos, "none", 0 );
    self.health = oldhp;
}

jumppad_think()
{
    while (1)
    {

        if (!isDefined(self.lastJump))
            self.lastJump = 0;

        //iprintlnbold(getTime() - player.lastJump);
        if (getTime() - self.lastJump <= 1000)
        {
            wait 0.05;
            continue;
        }
        self.lastJump = getTime();

	if (self useButtonPressed())
	{
        self iprintlnbold("^1~^7JUMP^1~");
        self bounce((0,0,1), 1000);
        self bounce((0,0,1), 1000);
        self bounce((0,0,1), 1000);
	}
    }
}

initJumppads()
{
thread jumppad_think();
}

main()
{
    initJumppads();
maps\mp\_load::main();
}

Edit izno: added [ code] tags!
Keep using [ code] tags plz!

but it give me errors.. pls i need help how i make the jetpack with press f in a shop?