利用CSS代码让Table发生固定表头

<style type="text/css">  
<!--  
body,table, td, a {font:9pt;}  
/*重点：固定行头样式*/  
.scrollRowThead{position: relative; left: expression(this.parentElement.parentElement.parentElement.parentElement.scrollLeft);z-index:0;}  
/*重点：固定表头样式*/  
.scrollColThead {position: relative;top: expression(this.parentElement.parentElement.parentElement.scrollTop);z-index:2;}  
/*行列交叉的地方*/  
.scrollCR { z-index:3;}  
/*div外框*/  
.scrollDiv {height:200px;clear: both; border: 1px solid #EEEEEE;OVERFLOW: scroll;width: 320px; }  
/*行头居中*/  
.scrollColThead td,.scrollColThead th{ text-align: center ;}  
/*行头列头背景*/  
.scrollRowThead,.scrollColThead td,.scrollColThead th{background-color:EEEEEE;}  
/*表格的线*/  
.scrolltable{border-bottom:1px solid #CCCCCC; border-right:1px solid #CCCCCC; }  
/*单元格的线等*/  
.scrolltable td,.scrollTable th{border-left: 1px solid #CCCCCC; border-top: 1px solid #CCCCCC; padding: 5px; }  
  
.scrollTable thead th{background-color:#EEEEEE;font-weight:bold;position:relative;}  
-->  
</style>  
  
<h1>利用CSS代码让Table产生固定表头</h1>  
<div id="scrollDiv" class="scrollDiv" >  
<table border="0" cellpadding="3" cellspacing="0" width="500" class="scrollTable">  
    <thead>  
<tr class="scrollColThead"  >  
  <th class="scrollRowThead scrollCR"  > </th>  
  <th colspan="2">列头</th>  
  <th colspan="2">列头</th>  
  <th rowspan="2">列头</th>  
</tr>  
<tr class="scrollColThead"  >  
  <th class="scrollRowThead scrollCR"  >h1</th>  
  <th >h2</th>  
  <th >h3</th>  
  <th >h4</th>  
  <th >h5</th>  
</tr>  
</thead>  
<tr>  
  <td class="scrollRowThead"  >  
    <input type="checkbox" name="checkbox" value="checkbox">  
    a</td>  
  <td>单元格2</td>  
  <td>单元格3</td>  
  <td>单元格4</td>  
  <td>单元格5</td>  
  <td>单元格5</td>  
</tr>  
<tr>  
  <td class="scrollRowThead"  >  
    <input type="checkbox" name="checkbox2" value="checkbox">  
    b</td>  
  <td>单元格2</td>  
  <td>单元格3</td>  
  <td>单元格4</td>  
  <td>单元格5</td>  
  <td>单元格5</td>  
</tr>  
<tr>  
  <td nowrap class="scrollRowThead"  >  
    <input type="checkbox" name="checkbox3" value="checkbox">  
    c</td>  
  <td nowrap>单元格2</td>  
  <td nowrap>单元格3</td>  
  <td nowrap>单元格4</td>  
  <td nowrap>单元格5</td>  
  <td nowrap>单元格5</td>  
</tr>  
<tr>  
  <td class="scrollRowThead"  >  
    <input type="checkbox" name="checkbox4" value="checkbox">  
    d</td>  
  <td>单元格2</td>  
  <td>单元格3</td>  
  <td>单元格4</td>  
  <td>单元格5</td>  
  <td>单元格5</td>  
</tr>  
<tr>  
  <td class="scrollRowThead"  >  
    <input type="checkbox" name="checkbox5" value="checkbox">  
    e</td>  
  <td>单元格2</td>  
  <td>单元格3</td>  
  <td>单元格4</td>  
  <td>单元格5</td>  
  <td>单元格5</td>  
</tr>  
<tr>  
  <td class="scrollRowThead"  >  
    <input type="checkbox" name="checkbox6" value="checkbox">  
    f</td>  
  <td>单元格2</td>  
  <td>单元格3</td>  
  <td>单元格4</td>  
  <td>单元格5</td>  
  <td>单元格5</td>  
</tr>  
<tr>  
  <td class="scrollRowThead" >  
    <input type="checkbox" name="checkbox7" value="checkbox">  
    g</td>  
  <td>单元格2</td>  
  <td>单元格3</td>  
  <td>单元格4</td>  
  <td>单元格5</td>  
  <td>单元格5</td>  
</tr>  
</table>  
</div>