原生table的表头固定，内容上下滚动

效果如下图，直接上解决方法

<style type="text/css">
*{margin:0;padding:0;list-style-type:none;}
a,img{border:0;}
body{font:12px/180% Arial, Helvetica, sans-serif, "新宋体";}
.demo{width:500px;margin:40px auto 0 auto;}
/* tablescroll */
.tablescroll{font:12px normal Tahoma, Geneva, "Helvetica Neue", Helvetica, Arial, sans-serif;background-color:#fff;}
.tablescroll td,.tablescroll_wrapper,.tablescroll_head,.tablescroll_foot{border:1px solid #ccc;}
.tablescroll td{padding:5px;}
.tablescroll_wrapper{border-left:0;}
.tablescroll_head{font-size:12px;font-weight:bold;background-color:#eee;border-left:0;border-top:0;margin-bottom:3px;}
.tablescroll thead td{border-right:0;border-bottom:0;}
.tablescroll tbody td{border-right:0;border-bottom:0;}
.tablescroll tbody tr.first td{border-top:0;}
.tablescroll_foot{font-weight:bold;background-color:#eee;border-left:0;border-top:0;margin-top:3px;}
.tablescroll tfoot td{border-right:0;border-bottom:0;}
</style>

<div class="demo">
<table id="thetable" cellspacing="0" cellpadding="0">
	<thead>
		<tr>
			<td>城市</td>
			<td>状态代码</td>
			<td>zip</td>
			<td>纬度</td>
			<td>经度</td>
			<td>县</td>
		</tr>
	</thead>
	<tbody>
		<tr class="first">
			<td>中国</td>
			<td>NY</td>
			<td>00501</td>
			<td>40.8152</td>
			<td>-73.0455</td>
			<td>Suffolk</td>
		</tr>
		<tr>
			<td>中国</td>
			<td>NY</td>
			<td>00544</td>
			<td>40.8152</td>
			<td>-73.0455</td>
			<td>Suffolk</td>
		</tr>
		<tr>
			<td>韩国</td>
			<td>PR</td>
			<td>00601</td>
			<td>18.1788</td>
			<td>-66.7516</td>
			<td>韩国</td>
		</tr>
		<tr>
			<td>Aguada</td>
			<td>PR</td>
			<td>00602</td>
			<td>18.381389</td>
			<td>-67.188611</td>
			<td>Aguada</td>
		</tr>
		<tr>
			<td>Aguadilla</td>
			<td>PR</td>
			<td>00603</td>
			<td>18.4554</td>
			<td>-67.1308</td>
			<td>Aguadilla</td>
		</tr>
		<tr>
			<td>Aguadilla</td>
			<td>PR</td>
			<td>00604</td>
			<td>18.4812</td>
			<td>-67.1467</td>
			<td>Aguadilla</td>
		</tr>
		<tr>
			<td>Aguadilla</td>
			<td>PR</td>
			<td>00605</td>
			<td>18.429444</td>
			<td>-67.154444</td>
			<td>Aguadilla</td>
		</tr>
		<tr>
			<td>Maricao</td>
			<td>PR</td>
			<td>00606</td>
			<td>18.182778</td>
			<td>-66.980278</td>
			<td>Maricao</td>
		</tr>
		<tr>
			<td>Anasco</td>
			<td>PR</td>
			<td>00610</td>
			<td>18.284722</td>
			<td>-67.14</td>
			<td>Anasco</td>
		</tr>
		<tr>
			<td>Angeles</td>
			<td>PR</td>
			<td>00611</td>
			<td>18.286944</td>
			<td>-66.799722</td>
			<td>Utuado</td>
		</tr>
		<tr>
			<td>Arecibo</td>
			<td>PR</td>
			<td>00612</td>
			<td>18.4389</td>
			<td>-66.6924</td>
			<td>Arecibo</td>
		</tr>
		<tr>
			<td>Arecibo</td>
			<td>PR</td>
			<td>00613</td>
			<td>18.1399</td>
			<td>-66.6344</td>
			<td>Arecibo</td>
		</tr>
		<tr>
			<td>Arecibo</td>
			<td>PR</td>
			<td>00614</td>
			<td>18.1399</td>
			<td>-66.6344</td>
			<td>Arecibo</td>
		</tr>
		<tr>
			<td>Bajadero</td>
			<td>PR</td>
			<td>00616</td>
			<td>18.428611</td>
			<td>-66.683611</td>
			<td>Arecibo</td>
		</tr>
		<tr>
			<td>Barceloneta</td>
			<td>PR</td>
			<td>00617</td>
			<td>18.4525</td>
			<td>-66.538889</td>
			<td>Barceloneta</td>
		</tr>
	</tbody>
	<tfoot>
		<tr>
			<td>10</td>
			<td>2</td>
			<td>15</td>
			<td align="center">-</td>
			<td align="center">-</td>
			<td>9</td>
		</tr>
	</tfoot>
</table>
</div>

script部分

<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="js/jquery.tablescroll.js"></script>
<script type="text/javascript">
$(document).ready(function($){
	$('#thetable').tableScroll({
		width:480,//这个地方的宽度是table的总宽度，列数多的时候可以把这个数字写大一些
		height:150
	});
});
</script>

以上js中的width是table的总宽度，如果table的列数很多，就需要宽度大一些，否则会出现thead和tbody错位的现象