[TYPO3-english] Powermail - prefill field using a hook

[Brian Bendtsen]

Hi

Im using powermail and need to prefill a textarea field with some data.

I have been looking at the hooks and it looks like I can use this one 
PM_FieldWrapMarkerHook1

But I dont see how I use it, can someone show me an example?

I know the basics about using hooks, so you dont need to explain that part.

So far I have tried this but without luck:

function PM_FieldWrapMarkerHook1($uid, $xml, $type, $title, 
$markerArray, $piVarsFromSession, $obj) {
		if($markerArray['###POWERMAIL_FIELD_UID###'] == 5) {
			foreach($piVarsFromSession['uid5'] as $key=>$value) {
				$markerArray['###VALUE###'] .= $value.'</br>';
			}
		}
	}

/BB