附上两个我经常使用的table样式：
<html>
<head>
<title></title>
<style type="text/css">
body,table{
font-size:12px;
}
table{
table-layout:fixed;
empty-cells:show;
border-collapse: collapse;
margin:0 auto;
}
td{
height:30px;
}
h1,h2,h3{
font-size:12px;
margin:0;
padding:0;
}
.table{
border:1px solid #cad9ea;
color:#666;
}
.table th {
background-repeat:repeat-x;
height:30px;
}
.table td,.table th{
border:1px solid #cad9ea;
padding:0 1em 0;
}
.table tr.alter{
background-color:#f5fafe;
}
</style>
</head>
<body>
<table width="90%">
<tr>
<th>学号</th>
<th>姓名</th>
<th>平时</th>
<th>期中</th>
<th>实验（践）</th>
<th>其它</th>
<th>期末</th>
<th>总评</th>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
</tr>
</table>
</body>
</html>
<html>
<head>
<title></title>
<style type="text/css">
.table
{
width: 100%;
padding: 0;
margin: 0;
}
th {
font: bold 12px "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif;
color: #4f6b72;
border-right: 1px solid #C1DAD7;
border-bottom: 1px solid #C1DAD7;
border-top: 1px solid #C1DAD7;
letter-spacing: 2px;
text-transform: uppercase;
text-align: left;
padding: 6px 6px 6px 12px;
background: #CAE8EA no-repeat;
}
td {
border-right: 1px solid #C1DAD7;
border-bottom: 1px solid #C1DAD7;
background: #fff;
font-size:14px;
padding: 6px 6px 6px 12px;
color: #4f6b72;
}
td.alt {
background: #F5FAFA;
color: #797268;
}
th.spec,td.spec {
border-left: 1px solid #C1DAD7;
}
/*---------for IE 5.x bug*/
html>body td{ font-size:14px;}
tr.select th,tr.select td
{
background-color:#CAE8EA;
color: #797268;
}
</style>
</head>
<body>
<table cellspacing="0" summary="The technical specifications of the Apple PowerMac G5 series">
<tr>
<th>选择</th>
<th>课程名称</th>
<th>课程编号</th>
<th>已经考试次数</th>
</tr>
<tr>
<td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
</tr>
<tr>
<td>2</td>
<td>2</td>
<td>2</td>
<td>2</td>
</tr>
<tr>
<td>3</td>
<td>3</td>
<td>3</td>
<td>3</td>
</tr>
</table>
</body>
</html>