Dropshadow plugin does not work in IE8

This works fine in FF and Chrome. Any help would be great.
Posting my scripts and CSS for reference:
//required for each plugin
$(document).ready(function() {
//plugin specific statements here
$("#content .section ").dropShadow({left: -4, top: 4, blur: 3, opacity: .1});
$(".sidebar .block").dropShadow({left: -4, top: 4, blur: 3, opacity: .1});
})
CSS:
#content .section {
background-color: #fff;
min-height: 400px;
}
.sidebar .block {
background-color: #FFFFFF;
margin-bottom: 20px;
padding: 20px;
}