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 go(arg){
	getXhr();
	xhr.onreadystatechange = function(){
		if(xhr.readyState == 4){
			leselect = xhr.responseText;
			document.getElementById('dville').innerHTML = leselect;
			document.getElementById('cp2').value = GetByID('cp').value;
			SetVal( GetByID('cp').value, 'cp2' );
		}
	}
	xhr.open("POST","scripts/communes.php",true);
	xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
	xhr.send("cp="+arg);
}
function chkCP(){
	if( GetByID('cp').value.length >= 5 ){
		go( GetByID('cp').value );
	}
}