public Action:OnPlayerRunCmd(client, &buttons, &impulse, Float:vel[3], Float:angles[3], &weapon)
{
    if (IsPlayerAlive(client) && GetEntityMoveType(client) == MOVETYPE_LADDER && (buttons & IN_MOVELEFT || buttons & IN_MOVERIGHT || buttons & IN_FORWARD || buttons & IN_BACK))
    {
        SetEntityGravity (target, amount)
    }
}