Twitter Bootstrap Datepicker error

[Solundos]

I tried everything but can't get the datepicker to show up.Bootstrap version v2.3.1.Latest version of http://www.eyecon.ro/bootstrap-datepicker/HTML:\[code\]<div class="input-append date" id="dpMonths" data-date="102/2012" data-date-format="yyyy-mm" data-date-viewmode="years" data-date-minviewmode="months"><input class="" size="16" type="text" value="http://stackoverflow.com/questions/15606022/2013-03" readonly><span class="add-on"><i class="icon-calendar"></i></span><script src="http://stackoverflow.com/questions/15606022/js/bootstrap-datepicker.js"></script><script type="text/javascript">$(function() { $('#dpMonths').datepicker();});</script>\[/code\]Javascript error:Uncaught TypeError: Cannot read property 'fn' of undefinedUncaught ReferenceError: $ is not defined