var oXmlHttp = null;
  var iPageCount = 3;
  var iCurPage = -1;
  var iWaitBeforeLoad = 5000;
  var iNextPageToLoad = -1;
  
  function showPage(sPage) {
  
      var divPage = document.getElementById("divPage" + sPage);
  
      if (divPage) {
          for (var i=0; i < iPageCount; i++) {
              var iPageNum = i+1;
              var divOtherPage = document.getElementById("divPage" + iPageNum);
              var aOtherLink = document.getElementById("aPage" + iPageNum);
              if (divOtherPage && sPage != iPageNum) {
                  divOtherPage.style.display = "none";
                  aOtherLink.className = "";
              }
          }
          divPage.style.display = "block";
          document.getElementById("aPage" + sPage).className = "current";
      } else {
          location.href = getURLForPage(parseInt(sPage));
      }
  }
  
  function getURLForPage(iPage) {
      var sNewUrl = location.href;
      if (location.search.length > 0) {
          sNewUrl = sNewUrl.substring(0, sNewUrl.indexOf("?"))
      }
      sNewUrl += "?page=" + iPage;
      return sNewUrl;
  }
  
  function loadNextPage() {
  
      if (iNextPageToLoad <= iPageCount) {
  
          if (!oXmlHttp) {
              oXmlHttp = zXmlHttp.createRequest();
          } else if (oXmlHttp.readyState != 0) {
              oXmlHttp.abort();
          }
  
          oXmlHttp.open("get", getURLForPage(iNextPageToLoad) + "&dataonly=true", true);
          oXmlHttp.onreadystatechange = function () {               
              
              if (oXmlHttp.readyState == 4) {
                  if (oXmlHttp.status == 200) {
                      var divLoadArea = document.getElementById("divLoadArea");
                      divLoadArea.innerHTML = oXmlHttp.responseText;                    
                      var divNewPage = document.getElementById("divPage" + iNextPageToLoad);
                      divNewPage.style.display = "none";
                      document.body.appendChild(divNewPage);  
                      divLoadArea.innerHTML = "";     
                      iNextPageToLoad++;
                      setTimeout(loadNextPage, iWaitBeforeLoad);             
                  } 
                  
                  
              }
          };    
          oXmlHttp.send(null);    
      }
  }
  
  //if Ajax is enabled, assign event handlers and begin fetching
  window.onload = function () {
      if (zXmlHttp.isSupported()) {
          
          if (location.href.indexOf("page=") > -1) {
              var sQueryString = location.search.substring(1);
              iCurPage = parseInt(sQueryString.substring(sQueryString.indexOf("=")+1));
          } else {
              iCurPage = 1;
          }
          
          iNextPageToLoad = iCurPage+1;
  
          var colLinks = document.getElementsByTagName("a");
          for (var i=0; i < colLinks.length; i++) {
              if (colLinks[i].id.indexOf("aPage") == 0) {
                  colLinks[i].onclick = function (oEvent) {                    
                      var sPage = this.id.substring(5);
                      showPage(sPage);
                      
                      if (oEvent) {
                          oEvent.preventDefault(); 
                      } else {
                          window.event.returnValue = false;
                      }
                  }
              }
          }
          
          setTimeout(loadNextPage, iWaitBeforeLoad);        
              
      }
  };