function showArticles(sectionId) {
    new Ajax.Request('./articleSelector.aspx?sectionid=' + sectionId,
        {
        method:'get',
        onSuccess: displayArticles
      });
}
function showArticle(articleId) {
    new Ajax.Request('./articleSelector.aspx?articleid=' + articleId,
        {
        method:'get',
        onSuccess: displayArticles
      });
}
var displayArticles = function(r)  {
    var d = document.getElementById("articlesdiv");
    d.innerHTML = r.responseText;
}

function showSubSection(sectionId, className) {
    var subsection = document.getElementById("subsections");
    
    for(var i = 0; i < subsection.childNodes.length; i++) {
        subsection.childNodes[i].style.display = "none";
    }
    
    var cssClass = className + "" + sectionId;
    var d = document.getElementById(cssClass);
    if(d != null) {
        d.style.display = "block";
    }
    showArticles(sectionId);
}