Rotating background upon refresh or reload

Hello,

I want to make a page similar to this http://www.pumafootball.com/ to be more accurate , every time I acces the page the background is different , and on every refresh the bg changes.I want to have 4-5 images and rotated them..how can i do this ?

I've found this script :

<script language="JavaScript">
<!--
/*
Random Image Link Script
By Website Abstraction (http://www.wsabstract.com)
and Java-scripts.net (http://www.java-scripts.net)
*/

function random_imglink(){
 var myimages=new Array()
 //specify random images below. You can have as many as you wish
 myimages[1]="logo.png"
 myimages[2]="logo3.png"
 myimages[3]="logo2.png"

 var ry=Math.floor(Math.random()*myimages.length)

 if (ry==0)
    ry=1
    document.write('<img src="'+myimages[ry]+'" border=0>')
}

 random_imglink()
//-->
</script>

PHP:

But this script doesn't repeat the image so it may be a bg.

Have any ideeas ?

Thank you

 

alistapart . com/d/randomizer/rotate.txt

javascript . internet . com/miscellaneous/random-image-rotator . html

 

The problem is that they can;t be set up for the background.