function poplink(i,numberOfTabs){
      var colourOfInactiveTab = "#708a7f";
      var colourOfActiveTab = "#708a7f";
      var colourOfInactiveLink = "#708a7f";
      var colourOfActiveLink = "#708a7f";
      if (document.getElementById){
        for (f=1;f<numberOfTabs+1;f++){
         document.getElementById('contentblock'+f).style.display='none';
        }
        document.getElementById('contentblock'+i).style.display='block';
      }
    }