帮忙改改 怎样使最小化的时候使从左边开始消失的 然后就立在左边了 最大化的时候在从左边出来！！！！

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<div id="dropin" style="width:300px;background-color:#FDF3D5;border: orange 1px solid;position:absolute;visibility:hidden;top:expression((this.offsetParent.clientHeight/2)-(this.clientHeight/2)+this.offsetParent.scrollTop);">
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      <span style="position: absolute; right:15;top:0;display:inline" onclick="onMinClick(this)">最小化
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      This is the content!
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