Fix IE6 png transparency

Don't know who use IE6 these days (already 2009 lah), but one of my friend need to fix his website. So here the css (modified from a google result)

<!--[if lt IE 7]>
<style>
img {
  position: relative;
  behavior: expression((this.runtimeStyle.behavior="none")&&(this.pngSet?this.pngSet=true:(this.nodeName == "IMG" && this.src.toLowerCase().indexOf('.png')>-1?(this.runtimeStyle.backgroundImage = "none",
  this.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.src + "', sizingMethod='image')",
  this.src = "http://imgur.com/ZOqET.gif"):(this.origBg = this.origBg? this.origBg :this.currentStyle.backgroundImage.toString().replace('url("','').replace('")',''),                                                                                                                                                     
  this.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + this.origBg + "', sizingMethod='crop')",
  this.runtimeStyle.backgroundImage = "none")),this.pngSet=true));
}
</style>
<![endif]-->