Mouseover DOM Inspector
I just found this gosh-darn useful Javascript tool. It’s good for helping to lay out your web page, or understand someone else’s page structure.
From Slayeroffice.com
This favelet allows you to view the properties of any HTML element on a page simply by mousing over the element. The element will be given a gray background, and a DIV element that trails the mouse cursor will contain the element type along with all of the specified attributes of the element.
Hit the “esc” key to turn the favelet off.
Right click on the following link and select “Add to Favorites” or “Bookmark this Link”, depending on your browser.
Mouseover DOM Inspector