如何修改下面的代码以使 Table THead 与 TD 匹配并尊重表格的大小（宽度）？现在发生的情况是表头扩展超出了 div 的大小，并且表格水平横跨页面。
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.1/themes/base/jquery-ui.css" />
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="http://code.jquery.com/ui/1.10.1/jquery-ui.js"></script>
<style type="text/css">
/*------------------------------------------------------------------
Table Style
------------------------------------------------------------------ */
table a:link {
color: #666;
font-weight: bold;
text-decoration:none;
}
table a:visited {
color: #999999;
font-weight:bold;
text-decoration:none;
}
table a:active,
table a:hover {
color: #bd5a35;
text-decoration:underline;
}
table {
font-family:Arial, Helvetica, sans-serif;
color:#666;
font-size:12px;
background:#eaebec;
border-radius:3px;
border-collapse:collapse; border-spacing: 0;
box-shadow: 0 1px 2px #d1d1d1;
border-left: 1px solid #ccc;
border-right: 1px solid #ccc;
table-layout: fixed;
}
table th {
border-bottom:1px solid #ccc;
border-left: 1px solid #ccc;
background: #ededed;
}
table tr {
text-align: center;
}
table td {
border-bottom:1px solid #ccc;
border-left: 1px solid #ccc;
background: #fafafa;
text-align: left;
}
table tr:hover td {
background: #f2f2f2;
}
table th, table td {
height: 20px;
width: 200px;
}
#container {
width : 98.7%;
height: 300px;
overflow-x: scroll;
overflow-y: scroll;
}
table tr td:first-child, table tr th:first-child {
border-left: 0;
}
table thead {
_position: fixed;
_position: relative;
_position: absolute;
}
TABLE THEAD TR TH {
top:expression(this.offsetParent.scrollTop);
border-top:1px solid #ccc;
_position:relative;
_position: absolute;
_position: fixed;
}
table tr:first-child td {
border-top: 0;
}
</style>
</head>
<body>
<div id="container">
<table id="data">
<!-- Table Header -->
<thead>
<tr>
<th>File Number</th>
<th> </th>
<th> </th>
<th>Firstname</th>
<th>Lastname</th>
<th>Progress</th>
<th>Vital Task</th>
</tr>
</thead>
<!-- Table Header -->
<!-- Table Body -->
<tbody>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>100%</td>
<td>Yes</td>
</tr><!-- Table Row -->
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>100%</td>
<td>Yes</td>
</tr><!-- Darker Table Row -->
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>20%</td>
<td>No</td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>80%</td>
<td>No</td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>100%</td>
<td>Yes</td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>23%</td>
<td>yes</td>
</tr>
<tr>
<td>ABC-123-123456</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>80%</td>
<td>No</td>
</tr>
<tr>
<td><a href="#yep-iit-doesnt-exist">Hyperlink Example</a></td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td>80%</td>
<td><a href="#inexistent-id">Another</a></td>
</tr>
</tbody>
<!-- Table Body -->
</table>
<script>
$(function() {
$( "#data tr th" ).resizable({
handles: 'e'
});
});
</script>
</div>
</body>
</html>