If you use Firefox and want a point-and-click solution, look into the Re-Pagination add-on at https://addons.mozilla.org/en-US/fir...re-pagination/. This can turn a multi-page thread into one long page (this is useful if you want to search within a thread, by the way). Unfortunately you cannot then save the long page as HTML, but you could "print" it to a PDF if you have the correct software.