转自：http://blog.sina.com.cn/s/blog_4b57e1d40100assv.html
最近研究固定HTML表头，找了几种方法都不怎么样，终于找了一个比较好的方法，共享一下:
源代码在这里!!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
</HEAD>
<BODY>
<div style="height: 250px; overflow-Y: auto;500px">
<table border=1 width="100%">
<tr style="background-color:red;position:relative;top:expression(this.offsetParent.scrollTop-2);">
<td>Name</td>
<td>Age</td>
<td>Position</td>
<td>Income</td>
<td>Gender</td>
</tr>
<tr>
<td>John</td>
<td>37</td>
<td>Managing director</td>
<td>90.000</td>
<td>Male</td>
</tr>
<tr>
<td>Susan</td>
<td>34</td>
<td>Partner</td>
<td>90.000</td>
<td>Female</td>
</tr>
<tr>
<td>David</td>
<td>29</td>
<td>Head of production</td>
<td>70.000</td>
<td>Male</td>
</tr>
<tr>
<td>Laura</td>
<td>29</td>
<td>Head of marketing</td>
<td>70.000</td>
<td>Female</td>
</tr>
<tr>
<td>Kate</td>
<td>18</td>
<td>Marketing</td>
<td>50.000</td>
<td>Female</td>
</tr>
<tr>
<td>Mona</td>
<td>21</td>
<td>Marketing</td>
<td>53.000</td>
<td>Female</td>
</tr>
<tr>
<td>Mike</td>
<td>21</td>
<td>Marketing</td>
<td>53.000</td>
<td>Male</td>
</tr>
<tr>
<td>Mark</td>
<td>25</td>
<td>Production</td>
<td>52.000</td>
<td>Male</td>
</tr>
<tr>
<td>Peter</td>
<td>33</td>
<td>Production</td>
<td>55.000</td>
<td>Male</td>
</tr>
<tr>
<td>Jennifer</td>
<td>24</td>
<td>Production</td>
<td>49.000</td>
<td>Female</td>
</tr>
<tr>
<td>David</td>
<td>25</td>
<td>Photography</td>
<td>51.000</td>
<td>Male</td>
</tr>
<tr>
<td>Anna</td>
<td>42</td>
<td>Head of photography</td>