var panels = new Array('panel1', 'panel2', 'panel3', 'panel4', 'panel5', 'panel6', 'panel7', 'panel8', 'panel9', 'panel10', 'panel11', 'panel12', 'panel13');
      var selectedTab = null;
      function showPanel(tab, name)
      {
        if (selectedTab) 
        {
          selectedTab.style.backgroundColor = '';
          selectedTab.style.paddingTop = '';
          selectedTab.style.marginTop = '4px';
        }
        selectedTab = tab;
        selectedTab.style.backgroundColor = '#e7e6e4';
        selectedTab.style.paddingTop = '6px';
        selectedTab.style.marginTop = '0px';

        for(i = 0; i < panels.length; i++)
          document.getElementById(panels[i]).style.display = (name == panels[i]) ? 'block':'none';

        return false;
      }