AJAX Chat Problem

XML Parsing Error: not well-formed
Location: http://www.scirra.com/phpBB3/chat/
Line Number 219, Column 340:return text.replace(arguments.callee.regExp,this.decodeSpecialCharsCallback);},decodeSpecialCharsCallback:function(str){switch(str){case '&':return '&';case '<':return '<';case '>':return '>';case ''':return '\'';case '"':return '"';default:return str;}},inArray:function(haystack,needle){var i=haystack.length;while(i--){if(haystack[i]===needle){return true;}}
----------------------------------------------------------------------------------------------------------------------------[/code:1opm97pe]

Any ideas?