Mine

function chat_form_data () {
	
	echo '<div id="message_field">';
	
	echo '</div>';
	
	echo '<script language="javascript" type="text/javascript">
	var messagefield = document.getElementById(\'message_field\');
	message_field.scrollTop = textareaelem.scrollHeight;
	</script>';
		
	echo '
	<form class="chat_application" method="post" action="chat.php">
	<input class="chat_application" type="text" id="message" name="message" />
	<button type="submit" class="chat_application" id="submit_form" name="submit_form"> Submit Form </button>
	</form></div>
	';
	}