ATTR-Selector?

Hi, I test 1.3.b1 and this Selector work any more:
<script type="text/javascript">
//<![CDATA[
$(document).ready(function() {
// no more with 1.3b1
// $("#content a[href$='.jpg']").lightBox();
$("#content a").lightBox();
});
//]]>
</script>
What is to do? Thanks.