function selectDIV(divName, link)
{
      var lnkSEO = document.getElementById('lnkSEO');
      var lnkPPC = document.getElementById('lnkPPC');
      var lnkWS = document.getElementById('lnkWS');
      var lnkCopy = document.getElementById('lnkCopy');

      lnkSEO.className = lnkCopy.className = lnkPPC.className = lnkWS.className = '';
            
      var div1 = document.getElementById('tcontent1');
      var div2 = document.getElementById('tcontent2');
      var div3 = document.getElementById('tcontent3');
      var div4 = document.getElementById('tcontent4');
      
      div1.style.visibility = div2.style.visibility = div3.style.visibility = div4.style.visibility = 'hidden';
      div1.style.display = div2.style.display = div3.style.display = div4.style.display = 'none';
      
      var divActive = document.getElementById(divName);
      divActive.style.visibility = 'visible';
      divActive.style.display = '';
      link.className = 'selected';
}