[jQuery] apply a class to the active sub menu

Hello,
I would like to apply a class to the active sub menu. I used
previously to select the sub menu with this:
var $path = location.pathname.substring(1);
$('#nav [EMAIL PROTECTED]"' + $path + '"]').addClass('active');
But it failed with the last jquery version
I tried:
$('#nav a[href="' + $path + '"]').addClass('active');
But with no success..

Any idea of the problem in the syntax used or of the syntax to use
with the new jquery version? Thanks in advance. Xavier