function verifPseudo(pseudo){	
		ajax('js/ajax/verifPseudoLibre.php?pseudo='+pseudo);	
}

function ajax(fichier)
{
     if(window.XMLHttpRequest) // FIREFOX
          xhr_object = new XMLHttpRequest();
     else if(window.ActiveXObject) // IE
          xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
     else
          return(false);
     xhr_object.open("GET", fichier, false);
     xhr_object.send(null);
     if(xhr_object.readyState == 4)
	 	document.getElementById('verifPseudo').innerHTML = xhr_object.responseText;
     else return(false);
}