How to avoid error message re: an exception that I don't care about

Question

I written a script that allows a user to click on a thumbnail image and then the script will change the html in order to play a particular video. It works, except that it throws some kind of error and I don' t know what it is. Since it works, I don't care what it is, but I would like to catch it. The popup error window says "An error occurred inside a plug-in contained on this page." Any ideas on what the error might be? Below is my code.
<script type="text/javascript">
function PlayVideo($Thumbnail)
// Then there is a PHP section where I look up the video file, $VideoFile, in a database with $Thumbnail as my criteria. For now, I have a file hardcoded into the param.
var $NEWhtml; // variable to build new script to swap with
$NEWhtml ='<object id="MP4player" classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" width="400" height="250" codebase="http://www.apple.com/qtactivex/qtplugin.cab">\n';
$NEWhtml +='<param name="src" value="VideosApproved/Toad Singing.mp4">\n';+
+$NEWhtml+ ='<param name="autoplay" value="true">\n';
$NEWhtml +='<param name="loop" value="false" >\n';+
+$NEWhtml+ ='<embed width="400" height="250" pluginspage="http://www.apple.com/quicktime/download/" type="video/quicktime" autoplay="true" controller="true"></embed>\n';
$NEWhtml +='</object>\n';
// REMOVE OLD ELEMENT
var specialzone = document.getElementById('MP4section');
var element = document.getElementById('MP4player');
element.parentNode.removeChild(element);
// ADD NEW ELEMENT
var specialzone = document.getElementById('MP4section');
var change = document.createElement('MP4player');
change.innerHTML = $NEWhtml;
specialzone.appendChild(change);
return true;
</script>

Answer 1

This site supports java
Java != javascript