var Ld1Id='';
var Ld2Id='';
var Ld3Id='';
var Ld4Id='';
var Ld5Id='';
var Ld6Id='';
var Ld7Id='';
var Ld8Id='';
var Ld9Id='';
var Ld10Id='';

var id_liste='';

function Valide1(val) {
	Ld1Id=val;
	id_liste='2';
	var LD_URL = 'Valide1.php?Ld1='+Ld1Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide2(val) {
	Ld2Id=val;
	id_liste='3';
	var LD_URL = 'Valide2.php?Ld2='+Ld2Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide3(val) {
	Ld3Id=val;
	id_liste='4';
	var LD_URL = 'Valide3.php?Ld3='+Ld3Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide4(val) {
	Ld4Id=val;
	id_liste='5';
	var LD_URL = 'Valide4.php?Ld4='+Ld4Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide5(val) {
	Ld5Id=val;
	id_liste='6';
	var LD_URL = 'Valide5.php?Ld5='+Ld5Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide6(val) {
	Ld6Id=val;
	id_liste='7';
	var LD_URL = 'Valide6.php?Ld6='+Ld6Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide7(val) {
	Ld7Id=val;
	id_liste='8';
	var LD_URL = 'Valide7.php?Ld7='+Ld7Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide8(val) {
	Ld8Id=val;
	id_liste='9';
	var LD_URL = 'Valide8.php?Ld8='+Ld8Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}

function Valide9(val) {
	Ld9Id=val;
	id_liste='10';
	var LD_URL = 'Valide9.php?Ld9='+Ld9Id;
	ObjetXHR(LD_URL)
	//if (Ld2Id!='') {ValideLd3('');	}
}




function ObjetXHR(LD_URL) {
	//creation de l'objet XMLHttpRequest
	if (window.XMLHttpRequest) { // Mozilla,...
		xmlhttp=new XMLHttpRequest();
		if (xmlhttp.overrideMimeType) {
			xmlhttp.overrideMimeType('text/xml');
		}	
		xmlhttp.onreadystatechange=ChargeLd;
		xmlhttp.open("GET", LD_URL, true);
		xmlhttp.send(null);
	} else if (window.ActiveXObject) { //IE 
		xmlhttp=new ActiveXObject('Microsoft.XMLHTTP'); 
		if (xmlhttp) {
			xmlhttp.onreadystatechange=ChargeLd;
			xmlhttp.open('GET', LD_URL, false);
			xmlhttp.send();
		}
	}
	// Bouton non apparent car modification de LD1 ou Ld2
	document.getElementById('buttons').style.display='none';
}

// fonction pour manipuler l'appel asynchrone
function ChargeLd() {
	if (xmlhttp.readyState==4) { 
		if (xmlhttp.status==200) { 
			//span id="niv2" ou "niv3"
			document.getElementById('niv'+id_liste).innerHTML=xmlhttp.responseText; 
			if (xmlhttp.responseText.indexOf('disabled')<=0) {
				//focus sur liste déroulante 2 ou 3
				document.getElementById('Liste'+id_liste).focus(); 
			}	
		}
	}
}

function Affiche_Btn() {
	document.getElementById('buttons').style.display='inline';
}
<!--
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->