SprayCan system!

#include <a_samp>
#include <callbacks>

new sprayveh[MAX_PLAYERS];
new spraying[MAX_PLAYERS];

forward sprayvehicle(playerid,vehicleid);
public sprayvehicle(playerid,vehicleid)
{
    if(IsPlayerSprayingVehicle(playerid,vehicleid))
    {
		GameTextForPlayer(playerid,"~G~Done",2000,5);
        ChangeVehicleColor(vehicleid, random(255), random(255));
        spraying[playerid] = 0;
	}
	else
	{
	    KillTimer(sprayveh[playerid]);
	    spraying[playerid] = 0;
	}
	return 1;
}

public OnPlayerSprayAtVehicle(playerid, vehicleid)
{
    if(spraying[playerid] == 0)
    {
        GameTextForPlayer(playerid,"~r~Spraying",2000,5);
    	sprayveh[playerid] = SetTimerEx("sprayvehicle",3000,false,"dd",playerid,vehicleid);
    	spraying[playerid] = 1;
	}
	return 1;
}