title: Find all instances of 'old' in a webpage and replace each with 'new', using a javascript bookmarklet
body: <p>What I want to do is replace all instances of 'old' in a webpage with 'new' in a JS bookmarklet or a greasemonkey script. How can I do this? I suppose jQuery or other frameworks are okay, as there're hacks to include them in both bookmarklets as well as greasemonkey scripts.</p>