<script type="text/javascript">                                                      
var APP = {                                                                             
"ajaxGet" : function(loc, dir) {                                                        
    $.ajax({                                                                            
        url     : loc,                                                                  
        type    : "GET",                                                                
        data    : "",                                                                   
        dataType: "json",                                                               
        error   : function() { alert("Error loading html document"); },                 
        success : function(res) {                                                       
            // Update appropriate web page portions                                     
            APP.updatePage(res);                                                        
            // Update analytics to track usage                                          
            APP.updateAnalytics(loc);                                                   
            /*                                                                          
            Push loc in history stack to enable browser back button,                    
            but do it only if the dir (direction) is not "back"                         
            otherwise history will get filled with "previous" location                  
            thereby setting a never-ending loop.                                        
            */                                                                          
            if (dir !== "back") {                                                       
                history.pushState(null, null, loc);                                     
            }                                                                           
        }                                                                               
    });                                                                                 
},                                                                                      
"updatePage" : function() {                                                             
},                                                                                      
"updateAnalytics" : function() {                                                        
};                                                                                      
                                                                                        
                                                                                        
$(document).ready(function() {                                                          
    /*                                                                                  
    Enable each link to fire the ajaxGet() function                                     
    on being clicked. Send an empty string for "dir".                                   
    */                                                                                  
    $("a").click(function() {                                                           
        APP.ajaxGet($(this).attr("href"), "");                                          
        /*                                                                              
        returning false ensures that the href                                           
        in the anchor is not fired, and instead,                                        
        ajaxGet() is used                                                               
        */                                                                              
        return false;                                                                   
    });                                                                                 
    /*                                                                                  
    The following bit of code enables the browser back button.                          
    When the user clicks the back button, the location from                             
    the history stack is fed to ajaxGet() to restore the previous                       
    web page.                                                                           
    */                                                                                  
    window.setTimeout(function() {                                                      
        window.addEventListener(                                                        
            "popstate",                                                                 
            function(e) {                                                               
                APP.ajaxGet(location.href, "back");                                                                          
            },                                                                          
            false                                                                       
        );                                                                              
    }, 1);                                                                              
});                                                                                     
</script>