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<div id="rounded">

<div id="rounded">
	<img src="img/top_bg.gif" alt="top" /><div id="main" class="container">
  	<h1>A simple AJAX driven jQuery website</h1>
 	<h2>Because simpler is better</h2>
    
 	<ul id="navigation">
		<li><a href="#page1">Page 1</a></li>
		<li><a href="#page2">Page 2</a></li>
		<li><a href="#page3">Page 3</a></li>
		<li><a href="#page4">Page 4</a></li>
		<li><img id="loading" src="img/ajax_load.gif" alt="loading" /></li>
	</ul>
    
 	<div class="clear"></div>
    
 	<div id="pageContent">
 	Hello, this is a demo for a <a href="http://tutorialzine.com/2009/09/simple-ajax-website-jquery/" target="_blank">Tutorialzine tutorial</a>. To test it, click some of the buttons above. Have a nice stay!</div>
    
 	</div>
  	<div class="clear"></div>
	<img src="img/bottom_bg.gif" alt="bottom" /></div>
</div>

$(document).ready(function(){ //executed after the page has loaded

    checkURL(); //check if the URL has a reference to a page and load it

    $('ul li a').click(function (e){    //traverse through all our navigation links..

            checkURL(this.hash);    //.. and assign them a new onclick event, using their own hash as a parameter (#page1 for example)

    });

    setInterval("checkURL()",250);  //check for a change in the URL every 250 ms to detect if the history buttons have been used

});

var lasturl=""; //here we store the current URL hash

function checkURL(hash)
{
    if(!hash) hash=window.location.hash;    //if no parameter is provided, use the hash value from the current address

    if(hash != lasturl) // if the hash value has changed
    {
        lasturl=hash;   //update the current hash
        loadPage(hash); // and load the new page
    }
}

function loadPage(url)  //the function that loads pages via AJAX
{
    url=url.replace('#page','');    //strip the #page part of the hash and leave only the page number

    $('#loading').css('visibility','visible');  //show the rotating gif animation

    $.ajax({    //create an ajax request to load_page.php
        type: "POST",
        url: "load_page.php",
        data: 'page='+url,  //with the page number as a parameter
        dataType: "html",   //expect html to be returned
        success: function(msg){

            if(parseInt(msg)!=0)    //if no errors
            {
                $('#pageContent').html(msg);    //load the returned html into pageContet
                $('#loading').css('visibility','hidden');   //and hide the rotating gif
            }
        }

    });

}

if(!$_POST['page']) die("0");

$page = (int)$_POST['page'];

if(file_exists('pages/page_'.$page.'.php'))
      echo file_get_contents('pages/page_'.$page.'.php');

 else echo 'There is no such page!';