function changePanel(panelName, panelId, numOfPanel)
{  
   for(var i = 1; i <= numOfPanel; i++)
   {
      var panel = panelName + i;
      var title = panelName + "title" + i;
      if(i != panelId)
      {
        document.getElementById(panel).style.display="none";
        document.getElementById(title).className = "normal";
        document.getElementById(title).setAttribute("class", "normal");
      }
      else
      {
        document.getElementById(panel).style.display="block";
        document.getElementById(title).className = "active";
        document.getElementById(title).setAttribute("class", "active");
      }
   }
}