TinyMCE script, WP not working anymore

Hello everyone, i wanted to add js to TinyMCE in WP-admin so i put this in my functions.php

$in['setup'] = <<<JS
[function(ed) {
           ed.onPreInit.add(function(ed) {
           console.debug('PreInit: ' + ed.id);
           console.debug(ed.initialized);
           var ec = ed.getDoc();
           var head = ec.getElementsByTagName("head")[0];
           var script = ec.createElement("script");
           script.src = "http://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js";
          //script.text  = "alert('voila!');"
           script.setAttribute('type','text/javascript');
           head.appendChild(script);
      });
 }
][0]
JS;

It’s F**** up my site, nothing works anymore, i have removed it ofcourse, but the error is still there.
“NetworkError: 500 Internal Server Error – “

Dose anyone have an ideea on how to fix this without reinstalling WP?

Thanks