IE7.0以下版本列表li中的元素错位一个上一个下的

<li><span class="tag">[${ross.parentName}] </span><a href="../ShowNews?id=${ross.newsID}">${ross.title } </a><span class="time">[${ross.updateDate}]</span></li>

.time{float:right}

.time{float:right;margin-:-20px;}

区别IE6与FF
background:orange;background:blue;
区别IE6与IE7
background:green !important;background:blue;
区别IE7与FF
background:orange; background:green;
区别FF，IE7，IE6
background:orange;background:green;_background:blue;
background:orange;background:green !important;background:blue;