$(function() {
    // Make URL parameters accessibles everywere by $.urlParam('my_param')
    $.urlParam = function(name){
        var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
        if (results==null){
           return null;
        }
        else{
           return results[1] || 0;
        }
    }

});