Hi guys, any help with loadVars and a random image from a folder?

Hi guys I have about 5 pngs that I need to be show based upon perhaps a loadvars, and a random background image loaded from a folder.

Its been ages since I used flash, can anyone point me in the right rirection for getting at somwthing like this.

I will be placing the textural pngs over the random background image. the png will be different depending on the loadvars set for each page.

I am sure there are loads oof tutorials out there but it was like i say ages ago since i was working in flash.

Any help?