var req = null;

function getReq()
{ 
    if (window.XMLHttpRequest) req = new XMLHttpRequest();
	else if (window.ActiveXObject) req = new ActiveXObject('Microsoft.XMLHTTP');
    else
	{
        alert('JavaScript : votre navigateur ne supporte pas les objets XMLHttpRequest...');
        req = false;
	}
}
	
function prov(secteur)
{
	getReq();
	req.onreadystatechange = function() 
	{ 
		if(req.readyState == 4) 
		{
			if(req.status == 200) 
			{
				document.getElementById("fournisseur").innerHTML=req.responseText;
			}	
		} 
	}; 
	req.open("POST", 'provider.php', true); 
	req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); 
	req.send("sector="+secteur);
}

function aff(fff)
{
	getReq();
	req.onreadystatechange = function() 
	{ 
		if(req.readyState == 4) 
		{
			if(req.status == 200) 
			{
				document.getElementById("fournisseur").innerHTML=req.responseText;
			}	
		} 
	}; 
	secteur=document.getElementById('sector').value;
	req.open("POST", 'provider.php', true); 
	req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); 
	req.send("sector="+secteur+"&fai="+fff);
}