Banner Rotation in (php)

<?php
session_start();

$links = array(
"http://www.google.com",
"http://www.msn.com",

);
//add a new link for the banner to a new line in the same format as above

$images = array(
"http://www.google.co.uk/intl/en_uk/images/logo.gif",
"http://stc.msn.com/br/hp/en-us/css/35/decoration/msn_b.gif",

);//add a new image link for the banner to a new line in the same format as above

//——– DO NOT EDIT BELOW THIS LINE———-
$count = count($links) -1;

$randnum = mt_rand(0,$count);

if ($randnum == $_SESSION['randnum'])
{
$randnum = mt_rand(0,$count);
}
$_SESSION['randnum'] = $randnum;
echo ‘<a href="’.$links[$randnum].’"><img style="border:none" src="’.$images[$randnum].’" /></a>’;

?>

$Img1 = "http://yoursite.com/image.jpg";
 $Url1 = "http://www.identity.st"; $Img2 = "http://www.hissite.com/bannerA.gif";
 $Url2 = "http://www.about.com";
 $Img3 = "http://hersite.com/MyImage.gif";
 $Url3 = "http://php.about.com";
   
 $num = rand (1,3);
 $Image = ${'Img'.$num};
 $URL = ${'Url'.$num};  Print "<a href=".$URL."><img src=".$Image." border=0></a>"; 

<?php include ("banner-rotator.php"); ?>