<?
function rasran(){
$t1='<a href="http://www.site.com" title="title" target="_blank"><img border="0" src="http://www.site.com/img1.gif" alt="title" /></a>';
$t2='<a href="http://www.site2.com" title="title" target="_blank"><img border="0" src="http://www.site.com/img2.gif" alt="title" /></a>';
$t3='<a href="http://www.site3.com" title="title" target="_blank"><img border="0" src="http://www.site.com/img3.gif" alt="title" /></a>';
$arr = Array("$t1","$t2","$t3");
$bkk = rand(0,count($arr)-1);
print $arr[$bkk];
}
print rasran();
?>