function getXMLHttpRequest()
{
   var xhr = null;
        if(window.XMLHttpRequest || window.ActiveXObject)
		{
			if(window.ActiveXObject)
			{
				try
				{
					xhr = new ActiveXObject("Msxml2.XMLHTTP");
				}
				catch(e)
				{
					xhr = new ActiveXObject("Microsoft.XMLHTTP");
				}
			}
			else
			{
				xhr = new XMLHttpRequest();
			}
        }
		else
		{
            alert("Votre navigateur ne supporte pas l'objet XMLHTTPRequest...");
            return null;
        }
    return xhr;
}
function setOpacity(elt, opacity)
{
    if (elt.style.opacity != undefined)
        elt.style.opacity = opacity;
    else if (elt.style.filter != undefined)
        elt.style.filter = 'alpha(opacity='+Math.round(100*opacity)+')';
}
function test(id_image)
{
	for (var i=1; i<=56; i++) { document.getElementById('photo_'+i).style.border=''; }
	document.getElementById('photo_'+id_image).style.border='solid rgb(70,77,97) 1px';
	document.getElementById('perso').value=id_image;
	id_a_enlever = id_image;
}