[Dark_Delphin]

Получился такой вот скрипт

<form action="example_extract_html.php" method="post">
<input type="text" name="link" value="">
<input type="submit" name="sub" value="button">
</form>


	   
	   <?php
include_once('simple_html_dom.php');

if (isset($_POST['sub']) ) {
 

// Create DOM from URL or file
$html = file_get_html($_POST ['link']);

// Find all images 
foreach($html->find('div[class=clearfix] h1') as $element) 
       echo $element->plaintext;
	   
	   // Find all images 
foreach($html->find('a[class=username]') as $element) 

echo '<span id="pars">';
echo $element->plaintext;
echo '</span>';
 
}
 

	   
?>

<input type="button" value="add" onclick = "document.getElementById('out').value += document.getElementById('pars').value + '\n'">

Но почму в поле input вставляется значение undefined?