Finally in IE9 MS started to support proper and useful CSS tags. But at this moment in time you still need to have support for IE7 and IE8. So If you want to make some nice box shadows, you are in a problem. Luckly this page comes to help http://css3pie.com/
works as it should, donate to those people, they made your life much easier :-)
Just a note on this. when adding this to your CSS, put in an path to your CSS files and this .htc file like
.region-page-closure{
background-image:url("../images/miletic_footer_bg.png");
background-repeat:repeat-x;
box-shadow: 0 0 6px #767676;
behavior: url(/sites/all/themes/miletic/css/PIE.htc);
height: 109px;
color:#5a5a5a;
}I am talking about behaviour part.