Diablo
site:habrahabr.ru jquery как грузить
http://habrahabr.ru/post/109309/
<script type="text/javascript" src="http://yandex.st/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">if (typeof jQuery == 'undefined') { document.write(unescape("%3Cscript src='/my-path/jquery-1.4.2.min.js' type='text/javascript'%3E%3C/script%3E")); }</script>