Someone

<table border="1" id="t">
<tr>

<td>.
</td>


<td>
<a onclick="doColumn(this);" href="#">
Montag
</a>
</td>

<td>
<a onclick="doColumn(this);" href="#">
Dienstag
</a>
</td>

<td>

<a onclick="doColumn(this);" href="#">
Mittwoch
</a>
</td>

<td>
<a onclick="doColumn(this);" href="#">
Donnerstag
</a>
</td>

<td>
<a onclick="doColumn(this);" href="#">
Freitag
</a>
</td>

<td>
<a onclick="doColumn(this);" href="#">
Samstag
</a>
</td>

<td>
<a onclick="doColumn(this);" href="#">
Sonntag
</a>
</td>


</tr>


<tr>

<td>
1
</td>

<td>
<center>
<input name="1_Montag" id="1_Montag"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="1_Dienstag" id="1_Dienstag"  type="checkbox">
</center>
</td>

<td>

<center>
<input name="1_Mittwoch" id="1_Mittwoch"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="1_Donnerstag" id="1_Donnerstag"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="1_Freitag" id="1_Freitag"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="1_Samstag" id="1_Samstag" checked  type="checkbox">
</center>
</td>

<td>
<center>
<input name="1_Sonntag" id="1_Sonntag" checked  type="checkbox">
</center>
</td>

</tr>

<tr>
<td>
2

</td>

<td>
<center>
<input name="2_Montag" id="2_Montag" checked  type="checkbox">
</center>
</td>

<td>
<center>
<input name="2_Dienstag" id="2_Dienstag"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="2_Mittwoch" id="2_Mittwoch"  type="checkbox">

</center>
</td>

<td>
<center>
<input name="2_Donnerstag" id="2_Donnerstag"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="2_Freitag" id="2_Freitag"  type="checkbox">
</center>
</td>

<td>
<center>

<input name="2_Samstag" id="2_Samstag" checked  type="checkbox">
</center>
</td>

<td>
<center>
<input name="2_Sonntag" id="2_Sonntag" checked  type="checkbox">
</center>
</td>

</tr>

<tr>
<td>
3
</td>

<td>
<center>
<input name="3_Montag" id="3_Montag" checked  type="checkbox">
</center>
</td>

<td>
<center>
<input name="3_Dienstag" id="3_Dienstag" checked  type="checkbox">
</center>
</td>

<td>
<center>
<input name="3_Mittwoch" id="3_Mittwoch"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="3_Donnerstag" id="3_Donnerstag"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="3_Freitag" id="3_Freitag"  type="checkbox">
</center>
</td>

<td>
<center>
<input name="3_Samstag" id="3_Samstag" checked  type="checkbox">
</center>

</td>

<td>
<center>
<input name="3_Sonntag" id="3_Sonntag" checked  type="checkbox">
</center>
</td>

</tr>


</table>