Конечный вариант:
<!DOCTYPE HTML>
<html>
<head>
<!--<meta charset="utf-8"> -->
<style>
table { /* table-layout: fixed Ячейки фиксированной ширины */
}
td{
width:30px;
border-right: 1px solid #fff;
border-left: 1px solid #fff;
}
tr.col1
{
font-weight: bold;
}
</style>
<script>
var day = (new Date).getDay()||7;
document.write(
'<style>',
'td:nth-of-type('+day+') {background: #079EBB;color: white;}',
'</style>'
)
</script>
</head>
<body>
<table cols="7" cellspacing="0">
<tr class="col1" cellspacing="1" bgcolor="#EEf0F5" align="center">
<td>ПН</td>
<td>ВТ</td>
<td>CР</td>
<td>ЧТ</td>
<td>ПТ</td>
<td>СБ</td>
<td>ВС</td>
</tr>
<tr align="center">
<td>9<sup>00</sup></td>
<td>9<sup>00</sup></td>
<td>9<sup>00</sup></td>
<td>9<sup>00</sup></td>
<td>9<sup>00</sup></td>
<td></td>
<td></td>
</tr>
<tr align="center">
<td>18<sup>00</sup></td>
<td>18<sup>00</sup></td>
<td>18<sup>00</sup></td>
<td>18<sup>00</sup></td>
<td>18<sup>00</sup></td>
<td></td>
<td></td>
</tr>
</table>
</body>
</html>