// JavaScript Document
function FireOffAJAXRequest(pagenum){

  var myXMLHttpRequest = GET_XMLHTTPRequest();
  if (myXMLHttpRequest) {	
    myXMLHttpRequest.open("GET", "ZaxPreviewslide.pl?p="+pagenum, true);
      myXMLHttpRequest.onreadystatechange = function (aEvt) {
        document.getElementById("previewcontainer").innerHTML = "<br><br><br><br><br><br><br><br><br><br><br><br><img src=\"ajaxload.gif\"><br><i>...page loading...</i>";
        if(myXMLHttpRequest.readyState == 4){
          document.getElementById("previewcontainer").innerHTML = myXMLHttpRequest.responseText;
        }
      };
    myXMLHttpRequest.send(null);
  }else{
    alert("A problem occurred instantiating the XMLHttpRequest object.");
  }
}