function request(oSelect) {

	var value = oSelect.options[oSelect.selectedIndex].value; // valeur retourné par le select
	var xhr   = getXMLHttpRequest();
	
	xhr.onreadystatechange = function() {
		if (xhr.readyState == 4 && (xhr.status == 200 || xhr.status == 0)) 
		{
			document.getElementById("loader").style.display = "none";
			if(value=="entreprise")
			{
			document.getElementById("nom_entreprise").style.display = "inline";
			document.getElementById("nom_association").style.display = "none";
			}
			else if(value=="association")
			{
			document.getElementById("nom_association").style.display = "inline";
			document.getElementById("nom_entreprise").style.display = "none";
			}
			else if(value=="particulier")
			{
			document.getElementById("nom_entreprise").style.display = "none";
			document.getElementById("nom_association").style.display = "none";
			}
			
			
			if(value=="modif_site")
			{
			document.getElementById("url_site").style.display = "inline";
			}
			else if(value=="new_site")
			{
			document.getElementById("url_site").style.display = "none";
			}
			
			
			
			
			
		} 
		else if (xhr.readyState < 4) 
		{
		/*	document.getElementById("loader").style.display = "inline";*/
			
		}
	};
	
	xhr.open("POST", "devis.php", true);
	xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	xhr.send("structure=" + value);
}