How to make an alphabetic navbar at the top of a category page?

[belsaas]

Hi!
I want to make an alphabetic nave bar at the top of the category page (like the attached picture), like when i want to sort all products begins with the letter A, I click on this letter in the alphabetic nave bar.

I have post a question for this before at this forum but didn't get any respond.
Do anyone know how I can mad one or do anyone know where I can buy a plg, modul or a component for this?

I use Joomla 2.5.19 and VM 2.6.6

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[belsaas]

Anyone?