or another way is like this:
enemycount=0 for enemy.enemyobject=each enemyobject enemycount=enemycount+1 next enemyindex=rand(1,enemycount) targetenemy.enemyobject=null for enemy.enemyobject=each enemyobject enemyindex=enemyindex-1 if enemyindex=0 then targetenemy.enemyobject=enemy.enemyobject exit endif next if targetenemy.enemyobject<>null then ;do what you want with the selected enemy endif