javascript - Mootools selector trouble -

i have html:

    <div id="link-thumbs-list"> <img src="image.php?f=http://www.jetphotos.net/trans.gif&amp;h=72&amp;w=128" /> <img src="image.php?f=http://www.jetphotos.net/logo-nb.jpg&amp;h=72&amp;w=128" /> <img src="image.php?f=http://www.jetphotos.net/trans.gif&amp;h=72&amp;w=128" /> </div> 

i need select f= (file url) src attribute of each imgs.. how can do?? thanksss

$$("#link-thumbs-list img").each(function(elem) {     var m = elem.get("src").match(/f=([^&]*)&/);     if (m && m[1]) {         elem.set("src", m[1]);     } });