css ie6 下的png

.classPng{
?position: absolute;
?left:200px;
?width: 361px;/*高度一定要设要不然背景会缩进*/
?height:100px;?/*高度一定要设要不然背景会缩进*/
?background:url(images/mapSplit.png) no-repeat;
??? /*IE6清除背景图*/
??? _background:none;
??? /*用filter载入的png图片就具有了alpha属性*/
??? _filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=scale, src="images/mapSplit.png");
}