How can I put attribute errors into a javascript popup?

[hem]

echo '<script>alert("'.$message.'");</script>'; 

Hmmm this did not seem to work for me... but maybe it's my lack of knowledge...

I tried adding it to tpl_message_stack_default.php and I got as far as the popup displaying ' .. ' but it won't show the message

Do you have an idea how to merge it into this file (show below)

<?php
?>
<?php for ($i=0, $n=sizeof($output); $i<$n; $i++) { ?>
  <div <?php echo $output[$i]['params']; ?>><?php echo $output[$i]['text']; ?></div>

<?php } ?>

Your help is highly appreciated!

Sorry '$message' in my previous message was just pseudo-code. Try this:

$message="";
foreach($output as $thisoutput)
 $message.=$thisoutput['text'].'\n';

echo '<script>alert("'.$message.'");</script>';