Attached Link: http://www.mnot.net/cache_docs/

Forcing links to open in a new window is generally a bad idea in web design.

In case of normal link, user can always open into new window if they want (typically, right click and select "open in new window" or similar). But when the web designer forces opening in new window, user does not have the choice.

Further, closing the window is much more difficult than just clicking Back button or pressing Backspace key.

It would be much better just to have a normal link and allow back button to work. Just make sure the pages are cacheable so that user does not need to wait for page to reload. See Caching Tutorial (the attached url).

If you must have the popup window, at least remove the useles menus from the right and top of page. They take up valuable screen space, and also slow down loading and make the page more messy. Instead, add the "next" and "previous" links.