var how_many_ads = 27;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
switch(ad) {
  case 0: content = '<a href="http://freecomputerbooks.tradepub.com/free/orm/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/orm468x60A.gif"></a>';
          break;
  case 1: content = '<a href="http://freecomputerbooks.tradepub.com/free/ew/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/ew468x60.gif"';
          break;
  case 2: content = '<a href="http://freecomputerbooks.tradepub.com/free/ew/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/ew468x60a.gif"></a>';
          break;
  case 3: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Tele" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/wbd468x60telecom.gif"></a>';
          break;
  case 4: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Info" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/hardocp468x60.gif"></a>';
          break;
  case 5: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Inet" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/wbd468x60internet.gif"></a>';
          break;
  case 6: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Tele" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/tele468x60.gif"></a>';
          break;
  case 7: content = '<a href="http://freecomputerbooks.tradepub.com/free/swd/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/swd468x60.gif"></a>';
          break;
  case 8: content = '<a href="http://freecomputerbooks.tradepub.com/free/biot/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/biot468x60.gif"></a>';
          break;
  case 9: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Biop" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/pharm468x60A.gif"></a>';
          break;
  case 10: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Biop" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/468x60pht.gif"></a>';
          break;
  case 11: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Eng" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/eng468x60A.gif"></a>';
          break;
  case 12: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Eng" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/468x60_E.gif"></a>';
          break;
  case 13: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Info" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/468x60gen.gif"></a>';
          break;
  case 14: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Foodb" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/food468x60A.gif"></a>';
          break;
  case 15: content = '<a href="http://freecomputerbooks.tradepub.com/free/fda/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/fa468x60A.gif"></a>';
          break;
  case 16: content = '<a href="http://freecomputerbooks.tradepub.com/free/bio/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/bioit468x60.gif"></a>';
          break;
  case 17: content = '<a href="http://freecomputerbooks.tradepub.com/free/bpi/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/biop468x60.gif"></a>';
          break;
  case 18: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Insur" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/wbd468x60insurance.gif"></a>';
          break;
  case 19: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Govt" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/wbd468x60govt.gif"></a>';
          break;
  case 20: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Comp" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/wbd468x60computer.gif"></a>';
          break;
  case 21: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Fi" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/bank468x60.gif"></a>';
          break;
  case 22: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Heal" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/wbd468x60health.gif"></a>';
          break;
  case 23: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Fi" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/broker468x60A.gif"></a>';
          break;
  case 24: content = '<a href="http://freecomputerbooks.tradepub.com/free/hre/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/hre468x60.gif"></a>';
          break;
  case 25: content = '<a href="http://freecomputerbooks.tradepub.com/?pt=cat&page=Trade" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/dan468x60A.gif"></a>';
          break;
  default: content = '<a href="http://freecomputerbooks.tradepub.com/free/ddj/" target=_blank><img alt="Free IT Magzines" border="0" src="http://freecomputerbooks.com/tradepub/ddj468x60.gif"></a>';
}
end='></a>';
//if (ad < 3)
//{
document.write(content);