Hi Fred,
I think this is the same question as your other post in german.
You can use html tables like this
<div class="catItemExtraFields">
<table>
<tr>
<td><?php echo $this->item->extrafields[0]->name . ": " . $this->item->extrafields[0]->name; ?></td>
<td><?php echo $this->item->extrafields[1]->name . ": " . $this->item->extrafields[1]->name; ?></td>
</tr>
<tr>
<td><?php echo $this->item->extrafields[2]->name . ": " . $this->item->extrafields[2]->name; ?></td>
<td><?php echo $this->item->extrafields[3]->name . ": " . $this->item->extrafields[3]->name; ?></td>
</tr>
</table>
</div>
This is the simplest way you can use, although you may need to customize the layout more according to your layout specs.