function open_w(url, name)
	{
	var ah = screen.availHeight;
	var aw = screen.availWidth;
	
	var width =  660;	
	var height = 440;
	
	var str = "scrollbars=yes,resizable=no,menubar=no,status=no," + "height=" + height + ",innerHeight=" + height;
	str += ",width=" + width + ",innerWidth=" + width;
	
	var xc = (aw - width) / 2;
	var yc = (ah - height) / 2;
	
	str += ",left=" + xc + ",screenX=" + xc;
	str += ",top=" + yc + ",screenY=" + yc;
	
	window.open(url, name, str);
	}

function open_aston(url, name)
	{
	var ah = screen.availHeight;
	var aw = screen.availWidth;
	
	var width =  380;	
	var height = 380;
	
	var str = "scrollbars=no,resizable=no,menubar=no,status=no," + "height=" + height + ",innerHeight=" + height;
	str += ",width=" + width + ",innerWidth=" + width;
	
	var xc = (aw - width) / 2;
	var yc = (ah - height) / 2;
	
	str += ",left=" + xc + ",screenX=" + xc;
	str += ",top=" + yc + ",screenY=" + yc;
	
	window.open(url, name, str);
	}

function empecheClicDroit(e)
	{
	if (document.all)
		{
		if (event.button == 2)
			{
			alert(message);
			return false;
			}
		}
	if (document.layers)
		{
		if (e.which == 3)
			{
			alert(message);
			return false;
			}
		}
	}