var xhr = new XMLHttpRequest();
        xhr.open("POST", "../php/server_code/book.php", true);
        xhr.setRequestHeader("Content-type", "application/json");
        xhr.onreadystatechange = function() {
                if (xhr.readyState === 4 && xhr.status === 200) {
                        var json = JSON.parse(xhr.responseText);
			var dejson = "";
			for(var key in json){
			    dejson += key.toUpperCase() + ": <strong>" + json[key] + "</strong>";
			    dejson += "<br/>";
			}
                        if (json.status == "OK") {
                        //    document.getElementById('display_price').innerHTML = dejson;
                           document.getElementById('b_entire').innerHTML = "<div style='text-align:center'> <strong> <h1 style='color:green'>Submitted!</h1> </strong> </div>";
                        } else {
                           document.getElementById('book_status').innerHTML = "Error!";
                        }
                }
        }