Add / Get / Remove / Change parameters in url

    addParamToUrl = function(param, value)
    {
        var loc = window.location;

        //added seperately to append ? before params
        var url = loc.protocol + '//' + loc.host + loc.pathname;
        var query = parseQueryString(loc.search);
        query[param] = value;

        url += "?" + $.param(query);

        //return the finished url
        return url;
    };

    removeParamToUrl = function(param)
    {
        var loc = window.location;

        //added seperately to append ? before params
        var url = loc.protocol + '//' + loc.host + loc.pathname;
        var query = parseQueryString(loc.search);
        delete query[param];

        url += "?" + $.param(query);

        //return the finished url
        return url;
    };

    changeUrl = function (page, url) {
        if (typeof (history.pushState) != "undefined") {
            var obj = { Page: page, Url: url };
            history.pushState(obj, obj.Page, obj.Url);
        } else {
            alert("Browser does not support HTML5.");
        }
    };

    parseQueryString = function( queryString ) {
        var params = {}, queries, temp, i, l;

        // Split into key/value pairs
        queries = queryString.split("&");

        // Convert the array of strings into an object
        for ( i = 0, l = queries.length; i < l; i++ ) {
            temp = queries[i].split('=');
            temp[0] = temp[0].replace("?", "");
            params[temp[0]] = temp[1];
        }

        return params;
    };

    getParamFromUrl = function(param)
    {
        var loc = window.location;

        //added seperately to append ? before params
        var query = parseQueryString(loc.search);
        return (query[param] ? query[param] : '');
    };