function despliega(caja) { 
  if (document.getElementById(caja))
 
 document.getElementById(caja).style.display=(document.getElementById
 (caja).style.display=="block"?"none":"block");
 } 
 
 function myArticles() {
  if (document.getElementById("myArticles"))
 
 document.getElementById("myArticlesTitle").style.cursor="pointer";
  document.getElementById("myArticlesList").style.display="none";
  var target=document.getElementById("myArticlesTitle");
  if (target.addEventListener)
  target.addEventListener("click", function() { despliega("myArticlesList");
 }, false);
  else
  target.attachEvent("onclick", function()
 {despliega("myArticlesList"); } );
 }

 if (window.addEventListener)
  window.addEventListener('load', myArticles, false); 
 else window.attachEvent("onload", myArticles);