MVP Event Script help

[Hossam]

	//===== eAthena Script =======================================
//= Monster Spawn Event
//===== By ===================================================
//= WhiteEagle
//===== Version ==============================================
//= 1.0
//============================================================
-	script	MSE	-1,{

	set .gm,99;	// GM Level

OnWhisperGlobal:
	if(getgmlevel() >= .gm) {
	if (.mob_left) {
	mes "^FF0000[Monsterspawn Event CP]^000000";
	mes "The Monsterspawn Event is already in progress!";
	mes "Would you stop it?";
	switch(select("Yes:No")){
case 1:
	close2;
	goto OnStop2;
case 2:
	close;
	}
}
	mes "^FF0000[Monsterspawn Event CP]^000000";
	mes "This is the Control Panel for the Monster Spawn Event.";
	mes "How can I help you?";
	next;
	switch(select("Start:Stop:Cancel")){
	
case 1:
	mes "^FF0000[Monsterspawn Event CP]^000000";
	mes "The Monster Spawn Event will now start.";
	close2;
	goto OnStart;
	
case 2:

case 3:
	close;
	}
}
	close;

OnMinute30:
OnStart:
	donpcevent "MSE::OnTimer1800000";
	set (.mobid,1115);	//Monster ID	
	set (.mobname$,"MVP");	//Monster Name
	set (.moba,1);	//Monster Anzahl
	set .@rand,rand(1,3);
	if (.@rand == 1) set .map$,"prontera";
	if (.@rand == 2) set .map$,"geffen";
	if (.@rand == 3) set .map$,"morocc";

	sleep2 1000;
	announce ("[Monsterspawn Event]: "+.moba+" "+.mobname$+" ظهر فى "+.map$+"",bc_all);
	monster(.map$,0,0,.mobname$,.mobid,.moba,"MSE::OnMyMobDead");
	set .mob_left,.moba;
	sleep2 1798000;
	donpcevent "MSE::OnTimer1800000";
	end;

OnTimer1800000:
	killmonster .map$,"MSE::OnMyMobDead";
	set .mob_left,0;
	end;

OnStop2:
	killmonster .map$,"MSE::OnMyMobDead";
	announce "تم انهاء الفاعلية من قبل الجى ام.",bc_all;
	set .mob_left,0;
	end;

OnStop:
	sleep2 2000;
	announce "انتهت الفاعلية.",bc_all;
	end;

OnMyMobDead:
	getitem 6379,10;
	set .mob_left,.mob_left-1;
	if (.mob_left == 0) {
               announce "[Monsterspawn Event]: "+strcharinfo(0)+" قام بقتل وحش اخر "+.mobname$+".",bc_all;
               donpcevent "MSE::OnStop";	
        } else {
               announce "["+.mob_left+"/"+.moba+"] "+.mobname$+" تبقى.",bc_all;
        }
        end;
}
	
	

how i can make this script random mvp 
now summon eddga how i can add random mvp ?

[Emistry]

set (.mobid,1115);	//Monster ID

change to

set (.mobid,-3);	//Monster ID