xxx.yyy.getTopLevelWindow = function($w)
{
    var w = $w || window;
    while (w.parent && w.parent !== w) w = w.parent;
    return w;
};

xxx.yyy.getArgument = function(argumentName)
{
    var topWindow  = xxx.yyy.getTopLevelWindow() || window;
    var thisWindow = window;

    var argumentValue = function(window) {
        window.AJS.$.namespace('xx.yy.zz.arguments');
        var value = window.AJS.$.trim(window.xx.yy.zz.arguments[argumentName] || '');
        return value == '' ? null : value;
    };

    return argumentValue(topWindow) || argumentValue(thisWindow);
};

(function()
{
    var issueId = xxx.yyy.getArgument('issueId') || '';
    if (issueId != '')
    {
        var options = $.extend({}, xxx.yyy.options, {    // options contains REST service url etc ...
            'type'  : 'GET',
            data    : { 'issueId'    : issueId },

            success : function (responseData, textStatus, XMLHttpRequest)
            {
                var data = responseData && responseData.issueData
                    ? responseData.issueData : {};
                xxx.yyy.loadIssueData(data);
            }
        });

        xxx.yyy.controller.loadIssueData(options);
    }
})();