newbie bolt question

[Dan]

So i had the chance to work on the car this weekend and was planning to replace the headlight. Unfortunatley though, when i was taking off the bolts that hold on the headlight cover (after removing the black plastic surround) the heads of two of them twisted off! So now i've got two bolt shafts stuck in the headlight, flush with the edge on both sides.
So, how do i remove these then? Or should i cut my losses and buy a new one?

Thanks very much
- Dan