Upload and random image code

hi guys,

1st thing, i don’t know how to use a php but i have a basic of a programming structure. i’m using Dreamweaver and i have taken a webhosting service to upload my website.

The Problem.
My boss want me to create a page where advertiser can upload an image(their ads) and the image will randomly display in certain page, let say adver.html. The objective is to let the advertiser manage on their own, and ease our side of management.

I have to say it now, the advertiser can also use the upload feature again and change the image. The image will replaced the old image. is it possible?

i need something like this. http://www.facebook.com/ads/create/?campaign_id=368901427978&placement=advf2&extra_1=0

can somebody help me with this? please?