if (KEY_DOWN(0x02) & KEY_DOWN(0x01))
{
    static DWORD time = 0;
    if (GetTickCount() - 300 > time)
    {
    static int weapon = 0;
    if(weapon == 0)
    {
    pPedSelf->SetCurrentWeaponSlot( eWeaponSlot (set.eweaponslot_2) );  
    weapon = 1;
    time = GetTickCount();
    }
    else if(weapon == 1)
    {
    pPedSelf->SetCurrentWeaponSlot( eWeaponSlot (set.eweaponslot_3) );  
    weapon = 0;
    time = GetTickCount();
    }
   }
  }