What is the best way to achieve cross-browser(ff,ie>6,chrome,opera,safari) curved corners on a div. I found this article http://jonraasch.com/blog/css-rounded-corners-in-all-browsers and I've followed instructions step by step multiple times, here is my css :

#content_wrapper{
    -moz-border-radius:25px 25px 25px 25px;
    -webkit-border-radius: 25px;
    -khtml-border-radius: 25px;
    border-radius: 25px;
    background-color:#F2DADC;
    border:25px solid #ECD3D5;
    height:780px;
    opacity:0.7;
    width:747px;
    margin:0px auto;
    position:relative;
    display:block;
    zoom:1;
}

<!--[if lte IE 8]>
<style>
#content_wrapper{
behavior: url(template/css/border-radius.htc);
border-radius: 20px;
}
</style>
<![endif]-->

Can somebody point me what am I doing wrong or is there a better way to achieve the same effect, its working in all browsers except in IE