אחי תנסה את זה
<?php
$pics = array(
"http://bla.com/image.jpg#http://bla.com/link",
"http://bla.com/image2.jpg#http://bla.com/link2",
"http://bla.com/image3.jpg#http://bla.com/link3",
"http://bla.com/image4.jpg#http://bla.com/link4",
"http://bla.com/image5.jpg#http://bla.com/link5");
$num1 = count($pics);
$num2 = rand(0,$num1);
$num = explode("#",$pics[$num2]);
echo "<a href=\"".$num[1]."\"><img src=\"".$num[0]."\" /></a>";
?>