<?php
echo '<a href="#" onClick="window.open(\'".$yol."/".$klass."\',\'\',\'width=500,h eight=500\')">".$uzanti[0]."</a>';
?>

<?php
echo "<a href=\"#\" onClick=\"window.open('$yol/$klass','','width=500,h eight=500')\">$uzanti[0]</a>";
?>