function recup_category(lettre2, cat, univers, root, chemin, id_element)
{
	lettre = lettre2;
	
	if (document.getElementById('select_tm_gauche'))
	{
		var tm = document.getElementById('select_tm_gauche').options[document.getElementById('select_tm_gauche').selectedIndex].value;
	} else {
		var tm = "";	
	}
	
	if (document.getElementsByName('ch_genre'))
	{
		var gm = document.getElementsByName('ch_genre');
		var tab_gm = new Array()
		for (i=0 ; i<gm.length ; i++)
		{
			if (gm[i].checked == true)
			{
				tab_gm.push(gm[i].value);	
			}
		}
		
		var get_gm = tab_gm.join(",");
	} else {
		var get_gm = "";
	}
	
	// Changement de classe
	var elems = document.getElementsByClassName('lettre lettre_active');
	var elems2 = document.getElementsByClassName('lettre toutes_lettres lettre_active');
	
	if (elems.length > 0)
	{
		elems[0].className = "lettre";
		document.getElementById("lettre_"+id_element).className = "lettre lettre_active";
		
	}
	
	if (elems2.length > 0)
	{
		elems2[0].className = "lettre toutes_lettres";
		document.getElementById("lettre_"+id_element).className = "lettre toutes_lettres lettre_active";
		
	}
	
	var xhr_object = null; 
	var data =null;
	if(window.XMLHttpRequest) // Firefox 
	   xhr_object = new XMLHttpRequest(); 
	else if(window.ActiveXObject) // Internet Explorer 
	   xhr_object = new ActiveXObject("Microsoft.XMLHTTP"); 
	else { // XMLHttpRequest non supporté par le navigateur 
	   alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
	   return;
	}
	
	var filename = "/ajax_filtre_gauche.php?id_univers="+univers+"&lettre="+lettre+"&id_categorie="+cat+"&chemin="+chemin+"&tm="+tm+"&gm="+get_gm;
		
	xhr_object.open("GET", filename, true); 	
	xhr_object.send(null);
	xhr_object.onreadystatechange = function() { 
	   if(xhr_object.readyState == 4) { 
		  document.getElementById('liste').innerHTML = xhr_object.responseText;
	   } 
	}
}