var tlinkads;
var linkadson=0;

function timedLinkAds()
     {
     var l1 = document.getElementById('linkad1'); 
     var l2 = document.getElementById('linkad2');
     var l3 = document.getElementById('linkad3'); 
  
     if(l1.style.display == "inline"){
          l1.style.display = "none";
          l2.style.display = "inline";
          l3.style.display = "none";
     } else if(l2.style.display == "inline"){
          l1.style.display = "none";
          l2.style.display = "none"; 
          l3.style.display = "inline";  
     } else {
          l1.style.display = "inline";
          l2.style.display = "none"; 
          l3.style.display = "none";  
     }

     theaderads=setTimeout("timedLinkAds()",8000);
}

function startLinkAds()
     {
     if (linkadson !=1)
       {
       linkadson=1;
       timedLinkAds();
     } else {
       stopLinkAds();
     }
}

function stopLinkAds()
     {
     clearTimeout(tlinkads);
     linkadson=0;
}