gistfile1.js

var retailrocket = window["retailrocket"] || {};
retailrocket.utils = (function() {
    return {
        objToQueryString: function(params) {
            var queryString = "";
            if (params)
                for (var key in params)
                    if (params[key] !== null && params[key] !== undefined) queryString += "&" + key + "=" + params[key];
            return queryString;
        },
        jsRequest: function(url) {
            var newJs = document.createElement('script');
            newJs.type = 'text/javascript';
            newJs.src = url;
            newJs.async = true;
            document.getElementsByTagName('head')[0].appendChild(newJs);
        },
        buildCallback: function(prefix, callback) {
            retailrocket.callbacks = retailrocket.callbacks || {
                nonce: 0
            };
            var callBackName = prefix + (retailrocket.callbacks.nonce++);
            retailrocket.callbacks[callBackName] = callback;
            return "retailrocket.callbacks." + callBackName;
        }
    }
}());

retailrocket.recommendation = (function() {
    return {
        personalCategory: function(partnerId, rrUserId, callback) {
            var callbackName = retailrocket.utils.buildCallback("personalCategory", callback);
            var url = "http://api.retailrocket.ru/api/1.0/Recomendation/personalCategoryRecommendation/" + partnerId + "/?rrUserId=" + rrUserId + "&format=json&callback=" + callbackName;
            retailrocket.utils.jsRequest(url);
        }
    };
}());

How to use

retailrocket.recommendation.personalCategory("50c8b21d421aa9279e537410", "53c63ab46636b12d60b56e1d", function(data) { alert(data) })