Help with creating Flash Rotating Client Logos' Banner?

I’m trying to build a banner that rotates (fade in, fade out) our clients logos on our company website. If you look at http://www.omniture.com/en/ at the bottom of their site they have client logos fading in and out using some sort of Flash script.

I’m fairly new to flash/actionscript. What needs to happen is anytime a logo is dragged into a folder on our website it will automatically go into the rotation of logos appearing on the website.

I’ve been trying to look for actionscripts already out there that do this but I can’t seem to find anything that I find ideal.

Any advice/tips would be great! Thanks so much!