function pagesuivante(page){
	xmlhttp = getXhr();
	//loading(true);
	xmlhttp.open('GET', 'layer/'+page+'.html', true);
	xmlhttp.onreadystatechange = function() {
		if (xmlhttp.readyState == 4) {
			loading(false);
			if (xmlhttp.status != 200) 
       			alert('Impossible d\'afficher la page.');
       		else
       		{
				var responseText = xmlhttp.responseText;
				
				document.getElementById("dbody").innerHTML = responseText;
				correctPNG();
			}
			loading(false);
       }
    }
    xmlhttp.send(null);
}

function getXhr() 
{ 
	xhr_objet = null;
	try
	{
		xhr_objet = new XMLHttpRequest();
	}
	catch(Error)
	{
		try
		{
			xhr_objet = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch(Error)
		{
			try
			{
				xhr_objet = new ActiveXObject("Msxml2.XMLHTTP");
			}
			catch(Error)
			{
				alert("Impossible de créer l'objet XMLHttpRequest.");
			}
		}
	} 
	
	return xhr_objet;
}