<?php function get_ad_codes($author) {
if($author == 'ali')
return '123789';
elseif ($author=='veli')
return '987878';
else // default, no author found
return '964743';
} ?>

<script type="text/javascript"><!--
google_ad_client = "pub-numaranumara";
google_ad_slot = "<?php echo get_ad_codes(get_the_author());?>";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>