[jQuery] css background-color not exists in IE with more then 2 classes..

[jQuery] css background-color not exists in IE with more then 2 classes..


Does anybody know why in IE:
jQuery.css(e, "background-color");jQuery.css(e, "background-color");
Not works on a elementl like:
<div class="directions rounded-big">
</div>
But will work with..
<div id="directions" class="rounded-big">
</div>