com.gargoylesoftware.htmlunit.ScriptException: Unexpected exception occurred while parsing HTML snippet: Property 'http://cyberneko.org/html/properties/balance-tags/fragment-context-stack' is not recognized.

I get this error when trying to run any scenario with akephalos.

The trigger seems to be this line in jquery-1.5.1.js:

```
div.innerHTML = "   <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
```
