My banner rotating script dispalys first image only.

script is like:

<?php
$bannerCounter = 1;
$bannerCode[$bannerCounter] = "<a href=\"http://www.kganyang.co.za\"/scanners.php target=\"_top\"> <img src=\"images/adverts/maq10.jpg\" width=\"90\" height=\"83\" alt=\"Buy a Scanner!\" border=\"0\"></a>";
$bannerCounter++;

$bannerCode[$bannerCounter] = "<a href=\"http://www.kganyang.co.za\"/scanners.php target=\"_top\"> <img src=\"images/adverts/maq2.jpg\" width=\"90\" height=\"83\" alt=\"Buy a Scanner!\" border=\"0\"></a>";
$bannerCounter++;

$bannerCode[$bannerCounter] = "<a href=\"http://www.kganyang.co.za\"/scanners.php target=\"_top\"> <img src=\"images/adverts/maq3.jpg\" width=\"90\" height=\"83\" alt=\"Buy a scanner\" border=\"0\"></a>";
$bannerCounter++;

$bannerCode[$bannerCounter] = "<a href=\"http://www.kganyang.co.za\"/scanners.php target=\"_top\"> <img src=\"images/adverts/maq4.jpg\" width=\"88\" height=\"88\" alt=\"Buy a scanner!\" border=\"0\"></a>";
$bannerCounter++;

$bannerAdtotals=$bannerCount-1;
if($bannerAdtotals >1)
{
mt_srand((double)microtime()*1234567);
$bannerPicked=mt_rand(1,$bannerAdtotals);
}
else
{
$bannerPicked=1;
}
$bannerAd=$bannerCode[$bannerPicked];
?>

how is $bannerCounter being passed everytime the user reloads a page?

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