var xhr = null; 
function getXhr(){
     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; 
	} 
}

function updateMetier(){
	getXhr();
	
	var region = document.getElementById('region').options[document.getElementById('region').selectedIndex].value
	var poste = document.getElementById('poste').options[document.getElementById('poste').selectedIndex].value

	
	xhr.onreadystatechange = function(){
		if(xhr.readyState == 4 && xhr.status == 200){
			var toto = xhr.responseText;
				document.getElementById('affichageOffres').innerHTML = xhr.responseText;
		}
    }
		
	xhr.open("POST","/scripts/emploi.php",true);
	xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded'); 
	xhr.send('region='+region+'&poste='+poste); 
}