wordpress gallery thumbnail links

Is there any way to change the thumbnail links to the image itself, and NOT to a separate page with the picture on it while using the [gallery] code?

I’ve used the [gallery] code because I have a lot of images, and it would take forever to add them to the page one by one.

It’s been suggested to me before that what I need to change is in the media.php file, but I can’t seem to find it…