public client_PreThink(id)
{
	if(!is_user_alive(id)) return PLUGIN_CONTINUE
	new nbut = get_user_button(id)
	new obut = get_user_oldbutton(id)
	if((nbut & IN_JUMP) && !(get_entity_flags(id) & FL_ONGROUND) && !(obut & IN_JUMP))
	{
		if(jumpnum[id] < 1)
		{
			dojump[id] = 1;
			jumpnum[id]++;
			return PLUGIN_CONTINUE
		}
	}
	if((nbut & IN_JUMP) && (get_entity_flags(id) & FL_ONGROUND))
	{
		jumpnum[id] = 0;
		return PLUGIN_CONTINUE
	}
	entity_set_float(id, EV_FL_fuser2, 0.0)		
	if (entity_get_int(id, EV_INT_button) & 2) 
	{
		new flags = entity_get_int(id, EV_INT_flags)
		if (flags & 1<<11)
			return PLUGIN_CONTINUE
		if ( entity_get_int(id, EV_INT_waterlevel) >= 2 )
			return PLUGIN_CONTINUE
		if ( !(flags & 1<<9) )
			return PLUGIN_CONTINUE
		new Float:velocity[3]
		entity_get_vector(id, EV_VEC_velocity, velocity)
		velocity[2] += 250.0
		entity_set_vector(id, EV_VEC_velocity, velocity)
		entity_set_int(id, EV_INT_gaitsequence, 6)
	}
	return PLUGIN_CONTINUE
}