IE6下position:absolute定位错误的bug和解决方法

例：

<style>
.test_1 {
	position:relative;
	margin:0 auto;
	text-align:center;
	width:500px;
	height:300px;
	background:#006600;
}
.c_1 {
	position:absolute;
	width:100px;
	height:20px;
	background:#0066CC;
}
</style>
<div class="test_1">
	<div class="c_1">
	</div>
</div>

解决办法：在父容器中，加入zoom:1;样式

<style>
.test_1 {
	position:relative;
	margin:0 auto;
	text-align:center;
	width:500px;
	height:300px;
	background:#006600;
	zoom:1;
}
.c_1 {
	position:absolute;
	width:100px;
	height:20px;
	background:#0066CC;
	top:0;
	left:0;
}
</style>