absolute与relative的区别

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<div id="Layer3">Layer3<br>
Layer3<br>
<div id="Layer2">Layer2<br>
    Layer2<br>
    <div id="Layer1">Layer1<br>
      Layer1<br>
      Layer1<br>
      Layer1<br>
    </div>
    Layer2<br>
    Layer2<br>
</div>
Layer3<br>
Layer3<br>
</div>
</body>
</html>

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sPosition String that specifies or receives one of the following values. static Default. Object has no special positioning; it follows the layout rules of HTML. absolute Object is positioned relative to parent element's position—or to the body object if its parent element is not positioned—using the top and left properties. relative Object is positioned according to the normal flow, and then offset by the top and left properties.

statict 正常工作流，left, op失效，

absolute相对于parent元素，left, top有效,如果left, top没value,或叫null，则left,top，ie产生一个值，其值等于正常工作流时的top, left（如日期控件是display,其定义一般是当前元素的postion底部＋10，或mouse postion）

relative，正常工作流，即上一次元素的，top. left有效

现在ie7已解决select的问题，这点与ff相近，box盒子定义也是如些，这点与ie6不同，以后再测试....

padding-top: 10px;
padding-left: 150px;
margin: 50px;

借助dw可以清楚其值