Janko Jovanovic’s got an excellent tutorial which shows you how to highlight the current active form area to improve usability of forms. He achieves this using jQuery.

He shows how to construct the form, style it and uses jQuery magic to get this functionality working for the form. He mentions that this improves the usability of large forms by focusing the user on the current action on the form.

You can see a demo of this over at:
http://www.jankoatwarpspeed.com/examples/ContextHighlighting/

Head over to the tutorial over at: Context highlighting using jQuery

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