_typeNr = round (random 3);
 
switch (_typeNr) do { 
                    case 0: {
                           //Script 1//
                           [] execVM "script_1.sqf";
                          };
 
                     case 1: {
                            //Script 2//
                            [] execVM "script_2.sqf"; 
                           };
 
                     case 2: {
                            //script 3//
                            [] execVM "script_3.sqf"; 
                           };

                      case 3: {
                             //script 4//
                             [] execVM "script_4.sqf";
                            };
};