variable if: all mob kill in current map

[domez86]

hi, I need the "variable if":
if all the mobs on the current map are dead.
ex:

----------------------------------------------------------------

mes: now I evoke the first 3 mobs:
atcommand "@monster xxxx 3";
if (all mobs killed in current map)
mes: now I evoke 4 more mobs:
atcommand "@monster xxxx 4";

----------------------------------------------------------------

thanks.

[BeWan]

here is the example

areamonster "ordeal_1-1",183,182,246,244,"[DS] BYORGUE",1839,10,"DS_HiddenNpc::Ondevildead";

Ondevildead:
    set $@mob,$@mob - 1;
    if($@mob == 15) mapannounce "ordeal_1-1","Guardian : 10 mobs to enter the 2nd round",0;
    if($@mob == 5) mapannounce "ordeal_1-1","Guardian : 5 mobs to enter 2nd round",0;
    if($@mob == 0) { 
        mapannounce "ordeal_1-1",Guardian will enter to 2nd round",0;
        goto Ondevil2;
    }
    end;