ทำไม hover ใน ie ไม่แสดงครับ

<style type="text/css">
body {
  font: 14px/1.4 arial;
}
.imgWrap {
  position: relative;
  width: 140px;
  height: 112px;
}
.imgDescription {
  margin-top: -90px;
  margin-left: 144px;
  width: 728px;
  height: 90px;
  position: absolute;
  visibility: hidden;
  opacity: 0;
  -moz-opacity: 0.00;
  filter: alpha(opacity=0);
}
.imgWrap:hover .imgDescription {
  visibility: visible;
  opacity: 1;
  -moz-opacity: 1.00;
  filter: alpha(opacity=100);
}
</style>

<div class="imgWrap">
  <img src="http://3.envato-static.com/assets/header-footer/microlancer/web-development-services-e546173320569b008737e36c59b25782.jpg" alt="polaroid" />
  <div class="imgDescription"><img src="http://static.adzerk.net/Advertisers/d893babe671c41118c1fece177e0a21a.jpg"/></div>
</div>