<tr class="odd">
<td>ungerade 1</td>
</tr>
<tr>
<td>gerade 1</td>
</tr>
<tr class="odd">
<td>ungerade 2</td>
</tr>
<tr>
<td>gerade 2</td>
</tr>
...
tr {
background-color: #f8f8f8;
}
tr.odd {
background-color: #e8e8e8;
}
<tr class="odd">
<td>ungerade 1</td>
</tr>
<tr>
<td>gerade 1</td>
</tr>
<tr class="odd">
<td>ungerade 2</td>
</tr>
<tr>
<td>gerade 2</td>
</tr>
...
tr {
background-color: #f8f8f8;
}
tr.odd {
background-color: #e8e8e8;
}