// JavaScript Document
function getXhr()
{
	var xhr = null;
	
	if(window.XMLHttpRequest)
	{
		xhr = new XMLHttpRequest(); 
	}
	else if(window.ActiveXObject)
	{ 
		try
		{
			xhr = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	else
	{
		alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); 
		xhr = false; 
	} 
	return xhr;
}

function load_modeles(div_id,ref_select_id,dest_select_id,selection)
{
//div_id : id du div qui contient le select à maj
//ref_select_id : id du select qui donne la valeur
//dest_select_id : id du select qui va étre créé ou modifier
	var xhr = getXhr();
	xhr.onreadystatechange = function()
	{
		if(xhr.readyState == 4 && xhr.status == 200)
		{
			di = document.getElementById(div_id,dest_select_id);
			di.innerHTML = xhr.responseText;
		}
	}
	//action
	xhr.open("POST","util/ajax_vehicules.php",true);
	xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded;charset=ISO-8859-1');	
	//envoi
	txt_marque = document.getElementById(ref_select_id).options[document.getElementById(ref_select_id).selectedIndex].value;
	xhr.send("txt_marque="+escape(txt_marque)+"&dest_select_id="+escape(dest_select_id)+"&selection="+escape(selection));
}