Of course if you're not lazy you could just go and look for that page now no longer available (old bookmarks etc) by pasting the address into the Wayback Machine, but if you're lazy, check your browser add-ons system and you might find you can get a button that does the same thing in a bone idle clicki clicki kind of way.
I'll post a more general kind of link :
Wikipedia on using the Wayback Machine
(This is just for those of you who suffer from the deadly vice of industriousness, and actually type out that address after the agonies of opening a tab, searching for where-the-hell-did-I-put-that-sodding-bookmark damaging your RSI'd fingers just a little bit more by clicking that button etc. Stop doing that to yourself. Just put a button up in your taskbar, and clik it when you get a 404).