1、IE6不支持min-height，解决办法使用css hack：

.target {
    min-height: 100px;
    height: auto !important;
    height: 100px;   // IE6下内容高度超过会自动扩展高度
}

<style type="text/css">
.outer {
    width: 215px;
    height: 100px;
    border: 1px solid red;
    overflow: auto;
    position: relative;  /* 修复bug */
}
.inner {
    width: 100px;
    height: 200px;
    background-color: purple;
    position: relative;
}
</style>

<div>
    <div></div>
</div>

<style type="text/css">
.p:hover,
.hover {
    background: purple;
}
</style>

<p id="target">aaaa bbbbb<span>DDDDDDDDDDDd</span> aaaa lkjlkjdf j</p>

<script type="text/JavaScript">
function addClass(elem, cls) {
    if (elem.className) {
        elem.className += ' ' + cls;
    } else {
        elem.className = cls;
    }
}
function removeClass(elem, cls) {
    var className = ' ' + elem.className + ' ';
    var reg = new RegExp(' +' + cls + ' +', 'g');
    elem.className = className.replace(reg, ' ').replace(/^ +| +$/, '');
}

var target = document.getElementById('target');
if (target.attachEvent) {
    target.attachEvent('onmouseenter', function () {
        addClass(target, 'hover');
    });
    target.attachEvent('onmouseleave', function () {
        removeClass(target, 'hover');
    })
}
</script>

.opacity {
    opacity: 0.4
    filter: alpha(opacity=60); /* for IE5-7 */
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=60)"; /* for IE 8*/
}

    display: inline-block;
    *display: inline;
    *zoom: 1;

链接: http://www.fly63.com/article/detial/495