init(key av)
{
    llRequestPermissions(av,PERMISSION_TAKE_CONTROLS);
    llTakeControls( CONTROL_FWD | CONTROL_BACK | CONTROL_LEFT | CONTROL_RIGHT ,TRUE,TRUE);
}

default
{
    state_entry()
    {
        if (llGetAttached())
        init(llGetOwner());
    }

    attach(key av)
    {
        if (av)
        {
            init(av);
        }
    }

    control(key id ,integer held, integer change)
    {
        vector key_held_vector=<!!(held & CONTROL_FWD) - !!(held & CONTROL_BACK),!!(held & CONTROL_LEFT) - !!(held & CONTROL_RIGHT),0.>;

        if (llGetAgentInfo(llGetOwner()) & AGENT_IN_AIR)
        llSetForce(ZERO_VECTOR,FALSE);
        else
        llSetForce( (-llVecNorm(key_held_vector)*120 - <0,0,1>)*llGetMass(),TRUE);
    }
}