I found 2 usefull firefox plugins on 456bereastreet.
Find inline CSS and JavaScript with Inline Code Finder
Inline Code Finder is a tool to traverse through all elements in a web page, and when it finds a HTML element with any of these, it will highlight them:
- Inline JavaScript events
- Inline style
- javascript: links
https://addons.mozilla.org/en-US/firefox/addon/9640
Obtrusive JavaScript Checker
Finds HTML elements with inline events and javascript: links.