Foreach loop question

Hi - I have a foreach loop where I want to split the output up so that I can display the content in 2 columns instead of 1.

At the minute I get the following HTML output:

<div id="itemExtraFields">
  <div class="even typeTextarea group6"> <!-- ITEM 1 --></div>
  <div class="odd typeTextarea group6"> <!-- ITEM 2 --></div>
  <div class="odd typeTextarea group6"> <!-- ITEM 3 --></div>
  <div class="even typeTextarea group6"> <!-- ITEM 4 --></div>
  <div class="odd typeTextarea group6"> <!-- ITEM 5 --></div>
  <div class="odd typeTextarea group6"> <!-- ITEM 6 --></div>
</div>


But What I really need to do is wrap a <div> around the 1st 4 items and then a <div> around the last 2. So I can style them as 2 columns.

Below is my php ... hopefully you can suggest the best solution for this.

Thanks

<div class="itemExtraFields">
			<?php foreach ($this->item->extra_fields as $key=>$extraField):?>
			<div class="<?php echo ($key%2) ? "odd" : "even"; ?> type<?php echo ucfirst($extraField->type); ?> group<?php echo $extraField->group; ?>">
				<!--<span class="itemExtraFieldsLabel"><//?php echo $extraField->name; ?>:</span>-->
				<span class="itemExtraFieldsValue"><?php echo $extraField->value; ?></span>
 	            <div class="clear"></div>
            </div>
			<?php endforeach; ?>
	  </div>

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