var XMLHttpRequestObject = false; 

      if (window.XMLHttpRequest) {
        XMLHttpRequestObject = new XMLHttpRequest();
      } else if (window.ActiveXObject) {
        XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
      } //end of XMLHttpRequest

//from nav bar div to main content div replacing inner html (A to B)

      function getData(dataSource, divID) { 
       
       if(XMLHttpRequestObject) {
 
          XMLHttpRequestObject.open("GET", dataSource); 

          XMLHttpRequestObject.onreadystatechange = function()  { 
            
            if (XMLHttpRequestObject.readyState == 4) {
            if (XMLHttpRequestObject.status == 200 || XMLHttpRequestObject.status == 304) { 
                   var obj = document.getElementById(divID);      
               obj.innerHTML = XMLHttpRequestObject.responseText; 
            } }
           
          } 
  
          XMLHttpRequestObject.send(null); 
        } 
      } //end of getData('rez20.txt', 'playDiv');
      
      
//from nav bar div to main content iframe (A to B)
   
      function getDataOne(url, frameID) { 
       
       if(XMLHttpRequestObject) {
               var docObj;
               var frameObj = document.getElementById(frameID);
               if (frameObj.contentDocument) {
               docObj = frameObj.contentDocument;
               } else {
               docObj = frameObj.document;
           }
          XMLHttpRequestObject.open("GET", url); 

          XMLHttpRequestObject.onreadystatechange = function()  { 
            
            if (XMLHttpRequestObject.readyState == 4) {
            if (XMLHttpRequestObject.status == 200 || XMLHttpRequestObject.status == 304) { 
               var dataSource = XMLHttpRequestObject.responseText;
               frameObj.innerHTML = dataSource;
              
            } }
           
          } 
  
          XMLHttpRequestObject.send(null); 
        } 
      } //end of getDataOne('rez2.php', 'primeFrame');as a call from index.php, to the main content div (A to B)
      


//for main content div to main content iframe  (B to B)    
   
   function getDataTwo(url, frameID) { 
       
       if(XMLHttpRequestObject) {
               var docObj;
               var frameObj = parent.document.getElementById(frameID);
               if (frameObj.contentDocument) {
               docObj = frameObj.contentDocument;
               } else {
               docObj = frameObj.document;
           }
          XMLHttpRequestObject.open("GET", url); 

          XMLHttpRequestObject.onreadystatechange = function()  { 
            
            if (XMLHttpRequestObject.readyState == 4) {
            if (XMLHttpRequestObject.status == 200 || XMLHttpRequestObject.status == 304) { 
               
               var dataSource = XMLHttpRequestObject.responseText;
               frameObj.innerHTML = dataSource;
              
            } }
           
          } 
  
          XMLHttpRequestObject.send(null); 
        } 
      } //end of getDataTwo('rez2.php', 'shop');As a call from within the main content div, back to the main  content div (B to B)