load jquery from parent: modify from http://javascriptisawesome.blogspot.com/2011/07/dont-reload-jquery-on-your-iframes.html

gistfile1.html

<script>
if(typeof parent.jQuery !== 'undefined')
{
    var $ = function(a,b){
     b = b || document;
     return parent.jQuery.apply(this,[a,b])
    };
    var jQuery = $;
}
else
{
 document.write(unescape("%3Cscript%20type%3D%22text/javascript%22%20src%3D%22//ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js%22%3E%3C/script%3E"));
}
</script>