2015-03-04_14-55-02.txt

#include <a_samp>
main(){print("loaded...");}
enum {
	PICK,
	LEAVE,
}
new bool:jetpackDetected[MAX_PLAYERS char] = {false, ...};

public OnPlayerUpdate(playerid) {
	if (GetPlayerSpecialAction(playerid) == SPECIAL_ACTION_USEJETPACK) {
		if(!jetpackDetected{playerid}) {
			jetpackDetected{playerid} = !jetpackDetected{playerid};

			onJetpack(PICK, playerid);
		}
	}
	else if (jetpackDetected{playerid}) {
		jetpackDetected{playerid} = !jetpackDetected{playerid};
		onJetpack(LEAVE, playerid);
	}
}

forward onJetpack(action, playerid);
public onJetpack(action, playerid) {
	SendClientMessage(playerid, -1, action == PICK ?("you've picked up the jetpack") : ("you've left your jetpack"));
}

public OnPlayerCommandText(playerid, cmdtext[]) {
	if (!strcmp(cmdtext, "/jp")) {
		SetPlayerSpecialAction(playerid, SPECIAL_ACTION_USEJETPACK);
		return true;
	}
	return false;
}