var FAQ = function () {
   
    var Article = function () {
    
        var iOldArticleID = null;
        
        var Open = function (iArticleID) {
            document.getElementById('faq-article-' + iArticleID).style.display = 'block';                 
        };

        var Close = function (iArticleID) {
            document.getElementById('faq-article-' + iArticleID).style.display = 'none';    
        };
        
        var Do = function (iArticleID) {
            if(iOldArticleID !== null) Close(iOldArticleID);   
            if(iArticleID != iOldArticleID) {
                Open(iArticleID);
                iOldArticleID = iArticleID;
            }
            else {
                iOldArticleID = null;    
            }
        }
        
        return {Do:Do};
    } ();
    
    return {Article:Article};
} ();