Random Banner / banner rotation

I'm asking for it once again.
Upload , or give links to 5 or so banner images and they get randomly generated and rotated. a new banner every time you refresh.
I have a script that works with normal images on normal html page but via script generator it doesn't work

heres the script:

Code:

<script language="JavaScript"><!--

//Javascript Created by Anime7 http://anime7.org

//store the quotations in arrays

images = new Array(5);

images[0] = "<a href = 'url of site or link'><img src='url of image'></a>";

images[1] = "<a href = 'url of site or link'><img src='url of image'></a>";

images[2] = "<a href = 'url of site or link'><img src='url of image'></a>";

images[3] = "<a href = 'url of site or link'><img src='url of image'></a>";

images[4] = "<a href = 'url of site or link'><img src='url of image'></a>";

index = Math.floor(Math.random() * images.length);

document.write(images[index]);

//done

// --></script>

this code works cos i use it in my html pages

I think that a rotating banner every time your refresh is great, especially for forums with artist... on my site i host banner contests and winners would love to see their works when they open my site. manual rotating is a hassle, and it doesn't change it when you refresh

vote guys