This is the best I could find - check the first email box you want to delete, next press the "shift" key and while holding it down go down the list as far as you want and click on the last email you want to delete and check the box. All the emails in between the top and bottom will now be marked as ready to delete. Just uncheck any of the selected emails you want to save and click the trash bin and poof the ones you marked as delete are gone.
Not my original, but remember using this procedure for editing.
