Source : http://stackoverflow.com/questions/1896080/select-first-element-that-doesnt-have-a-specific-class.
<ul>
<li class="someClass">item 1</li>
<li>item 2</li> <-- I want to select this
<li class="someClass">item 3</li>
<li>item 4</li>
</ul>
$('li:not(.someClass):first')