function whosonchat()
{
	var xhr_recept;
	
	if(window.XMLHttpRequest)
		{
			xhr_recept=new XMLHttpRequest();
		}
	
	else if(window.ActiveXObject)
		{
			xhr_recept=new ActiveXObject('Microsoft.XMLHTTP');
		}
	
	xhr_recept.open('POST','./chat/wievonchat.php',true);
	xhr_recept.onreadystatechange=function()
		{
			if(xhr_recept.readyState==4)
				{					
					document.getElementById('chat_u_connected').innerHTML=xhr_recept.responseText;
					if(xhr_recept.responseText=='')
					{
					document.getElementById('chat_u_connected').innerHTML='erreur';
					}
				}		
		}
	xhr_recept.setRequestHeader('Content-type','application/x-www-form-urlencoded');	
	var cargo_r="yop=yop";
	xhr_recept.send(cargo_r);
}