I'm kind of confused. Is your spawners a zombie or skeleton.
Turtle and Lissy have solved this issue but I want to point some things out for gamerflame.
If your spawners is a zombie, zombie spawners can spawn zombie villagers.
If it's a skeleton, whoops, sorry, you're out of luck.
ALSO, zombie villagers are a very expensive (in materials) way to make more villagers.
I suggest a villager farm with doors....