Changing page length display when threads exceed 'X" number of pages

[rasp187]

On my forum, when a thread exceeds a certain amount of pages, it continues to put the page number in-line with the previous page number (i.e. 58, 59, 60, 61, etc.). The problem with this is it increases the width of the page tremendously, and in order to get to the next page, you have to scroll horizontally.

I'm basically wondering how I can set it so it cuts off at a specific page number, then starts a line underneath the current one and continues? That way I can specify the length of the amount of pages displayed on one line?

Thanks for any help.