The following code will invalidate a document. As it counts the template html as being part of the document.

<script type="text/javascript" charset="utf-8">
window.onload = function() {
   getTwitters('Twitter', { 
     id: 14908033, 
     count: 5, 
     enableLinks: true, 
     ignoreReplies: true, 
     clearContents: true,
     template: '<a href="http://twitter.com/%user_screen_name%/statuses/%id%/" class="tweetLink">%time%</a><span class="tweet">%text%</span>'
   });
}
</script>