This Artical explains how to improve form usability adding an auto message which appears and disappears with a nice fade-in and fade-out effect when an user select a field. I used Scriptaculous toggle effect to implement it. For more info download the full code or take a look at how it works.

Step 1: include scriptaculous libraries
Create a new page index.html and add a link to prototype.js and scriptaculous.js in the <head> tag of your page:

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