function changementville()
{
var xhr=null;
    
    if (window.XMLHttpRequest) { 
        xhr = new XMLHttpRequest();
    }
    else if (window.ActiveXObject) 
    {
        xhr = new ActiveXObject("Microsoft.XMLHTTP");
    }
    xhr.onreadystatechange = function() { ville(xhr); };
    
document.getElementById("ville").options[document.getElementById("ville").selectedIndex].text ="Chargement...";
    
    //on appelle le fichier reponse.txt
    xhr.open("POST", "lesvilles", true);
    xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    sel = document.getElementById('departement');
    iddepartement = sel.options[sel.selectedIndex].value;
    xhr.send("iddepart="+iddepartement);
}
 
function ville(xhr)
{
    if (xhr.readyState==4 && xhr.status == 200) 
    {
    	var docXML= xhr.responseXML;
    	var items = docXML.getElementsByTagName("v");
		var items2 = docXML.getElementsByTagName("a");
		document.getElementById("ville").options.length = items.length;
		
 
       for (i=0;i<items.length;i++)
    	{
    		document.getElementById("ville").options[i].value = items2.item(i).firstChild.data; 
    		document.getElementById("ville").options[i].text = items.item(i).firstChild.data; 
    	}
 
    }
}
function afficheville() 
{ 
window.open(document.getElementById("ville").options[window.document.getElementById("ville").selectedIndex].value, '_self'); 
return false;
} 
function cacher(type)
{
	if (type)
		{
			document.getElementById("option1").style.display = "none";
			document.getElementById("option2").style.display = "block";
		}
	else
		{
			document.getElementById("option2").style.display = "none";
			document.getElementById("option1").style.display = "block";
		}
}
function appel()
{
	if (document.getElementById("champ1_0").checked == true) cacher(1);
	else if	(document.getElementById("champ1_0").checked == false) cacher(0);	
}
function appel2()
{
	if (document.getElementById("projet").value == 1) cacher(0);
	else if	(document.getElementById("projet").value == 2) cacher(1);
	else {
	document.getElementById("option1").style.display = "block";
	document.getElementById("option2").style.display = "block";
	}
}