function AjaxTimeoutTimer(strLength)
{
    //Set all of the defaults      
    this.loaded = false;
    this.intHeight = 600;
    this.intDivHeight = 150;
    this.objDiv = null;
    this.objIFr = null;
    this.top = 0;
    this.sessionLength = 1000*60*20;
    if(typeof(strLength)!="undefined")this.sessionLength = strLength;
    var timerWarn = window.setTimeout(loadMessage,this.sessionLength);
    this.maxWait = 1000*60*5;
    this.title = "Timeout Notification";
    this.message = "Your current session is about to expire. " + 
                   "In order to remain logged in and avoid loosing " + 
                   "any data you may have entered, please press " + 
                   "the <span style='color:green'>Confirm</span> button " +
                   "to extend your session.";
    this.confirm = "Confirm";
    this.ignore = "Ignore";
    this.extendedMessage = "Your session has most likely been expired. " +
                           "Press the <span style='color:green'>Confirm</span> " +
                           "button to verify this."
    this.serverURL = null;
    var ref = this;
    
    //determine browser height and height of div
    function calcBrowserSize(){
      if(self.innerHeight){
        ref.intHeight = self.innerHeight;
        ref.intDivHeight = ref.objDiv.scrollHeight;
      }
      else if(document.documentElement && document.documentElement.clientHeight){
        ref.intHeight = document.documentElement.clientHeight;
        ref.intDivHeight = ref.objDiv.clientHeight;
      }
      else if(document.body){
        ref.intHeight = document.body.clientHeight;
        ref.intDivHeight = ref.objDiv.clientHeight;
      }
      ref.intHeight = parseInt(ref.intHeight);
      ref.intDivHeight = parseInt(ref.intDivHeight);
    }


    //Start to display message on scroll
    function loadMessage(){
    
      if(ref.loaded == false)ref.loaded = createAjaxConfirm();        
      //set reference
      ref.objDiv = document.getElementById("divAjaxTimer");
      ref.objIFr = document.getElementById("ifAjaxTimer");
      
      //position block off screen and show it
      ref.objDiv.style.top = "-1000px";
      ref.objIFr.style.top = "-1000px";
      ref.objDiv.style.display = "block";
      ref.objIFr.style.display = "block";
      if(navigator.userAgent.toLowerCase().indexOf("opera") != -1)ref.objIFr.style.visibility = "hidden";
      
      //Set all of the elements text
	  document.getElementById("divAjaxBut").style.display = "block";
	  document.getElementById("divAjaxContent").innerHTML = ref.message;
	  document.getElementById("divAjaxTitle").innerHTML = ref.title;
	  document.getElementById("ajaxB1").value = ref.confirm;
	  document.getElementById("ajaxB2").value = ref.ignore;
	  
	  //position block to top edge of screen
      calcBrowserSize();
      ref.objDiv.style.top = -ref.intDivHeight + "px";
      ref.objIFr.style.top = -ref.intDivHeight + "px";
      
      //prepare block to be scrolled in
      ref.top = -ref.intDivHeight;
      timerScroll = window.setInterval(scrollIn,1);
        timerWait = window.setTimeout(extendedWait,ref.maxWait);
    }

    //Determine how much user scrolled page down
    function GetScroll(){    
      var scrollY = document.documentElement.scrollTop;
      if(!scrollY)scrollY = document.body.scrollTop;            
      if(!scrollY)scrollY = window.pageYOffset;               
      if(!scrollY)scrollY = 0;
      return scrollY;
    }
    
    //some local(private) varaibles
    var timerScroll = null;
    var timerReject = null;
    var intStep = 4;
    var intStop = Math.floor(ref.intHeight/5);
	var timerUpdate = null;
	var intDotCount = 0;
	var timerWait = null;

    //Function moves confirmation window into view
    function scrollIn(){
      if(parseInt(intStep) + parseInt(ref.top) <= parseInt(intStop) ){
        ref.top += intStep;
        var intT = ref.top + GetScroll();;
		ref.objDiv.style.top =  intT + "px";
		ref.objIFr.style.top =  intT + "px";
      }
      else{
         var cancel = window.clearInterval(timerScroll);
         ref.objDiv.style.top = GetScroll() + intStop + "px";
         ref.objIFr.style.top = ref.objDiv.style.top;
      }
    }
    
    //Confirm button pressed, make request, hide buttons, start annimation
	this.confirmTimer = function(){
      timerUpdate = window.setInterval(updateMessage,250);
      document.getElementById("divAjaxBut").style.display = "none";
      makeHttpRequest();
	}

    //Hide information if the ignore button was clicked
	this.ignoreTimer = function(){
      ref.objDiv.style.display = "none";
      ref.objIFr.style.display = "none";
	}

    //Annimate the request waiting time so it looks fancy
	function updateMessage(){
	  var strDotsMessage = "Updating Session.";
	  for(x=0;x<intDotCount;x++)strDotsMessage+=".";
	  document.getElementById("divAjaxContent").innerHTML = strDotsMessage;
	  intDotCount++;
	  if(intDotCount>4)intDotCount = 0;
	}
	
	//change message from normal to extended info
	function extendedWait(){
	  document.getElementById("divAjaxContent").innerHTML = ref.extendedMessage;
	}

    //Function Prepares calls xmlHttpRequest
    function makeHttpRequest(){
    
      //Make sure we set the server side page          
      if(ref.serverURL==null){
        alert('Errror: Server Side Code was not specified by web master!');
        ref.objDiv.style.display = "none";
        ref.objIfr.style.display = "none";
        return false;
      }
      
      //create reg exp so we do not grabbed cached material
      var regEx = /(\s|:)/gi;
      var strDT = "ts=" + new Date().toString().replace(regEx,"");                              
      
      //Make the request to the server
      var loader1 = new net.ContentLoader(ref.serverURL,finishRequest,null,"POST",strDT); //Make request
    
    }
    
    //Function takes XML document 
    function finishRequest(){
      timerWarn = window.setTimeout(loadMessage,ref.sessionLength);
      var bx = window.clearTimeout(timerUpdate);
      var strDoc = this.req.responseText;  //Grab HTML
      if(strDoc.indexOf("Session Updated - Server Time:") == 0){
        document.getElementById("divAjaxContent").innerHTML = "Your session was extended sucessfully!";
        var timerHide = window.setTimeout(hideDiv,1000);
      }
      else{
        document.getElementById("divAjaxContent").innerHTML = "Your session has timed out! Re-login if necessary";
        var timerHide = window.setTimeout(hideDiv,2000);
      }
    }
    
    function createAjaxConfirm(){
      var ifr = document.createElement("iframe");
  
      var div1 = document.createElement("div");
      var div2 = document.createElement("div");
      var div3 = document.createElement("div");
      var div4 = document.createElement("div");
  
      var btn1 = document.createElement("input");
      var btn2 = document.createElement("input");
  
      ifr.id = "ifAjaxTimer";
      div1.id = "divAjaxTimer";
      div2.id = "divAjaxTitle";
      div3.id = "divAjaxContent";
      div4.id = "divAjaxBut"; 
  
      btn1.type="button";
      btn2.type="button";
      btn1.id = "ajaxB1";
      btn2.id = "ajaxB2";
      btn1.className = "confirm";
      btn2.className = "ignore";
      btn1.onclick = function(){ajaxTimer.confirmTimer();return false;}
      btn2.onclick = function(){ajaxTimer.ignoreTimer();return false;}
      btn1.value = "text";
      btn2.value = "text";     
 
      div1.appendChild(div2);   
      div1.appendChild(div3);
      div4.appendChild(btn1);
      div4.appendChild(btn2);
      div1.appendChild(div4); 

      document.forms[0].appendChild(ifr);
      document.forms[0].appendChild(div1);
        
      return  true;
    }
    
    //Hide div and iframe
    function hideDiv(){
      ref.objDiv.style.display = "none";
      ref.objIFr.style.display = "none";
    }
}