function afficher(page){
if(page=='vente'){
document.getElementById('image_menu').src='pictures/menus/1.jpg'}
else if(page=='location'){
document.getElementById('image_menu').src='pictures/menus/2.jpg'}
else if(page=='entretien'){
document.getElementById('image_menu').src='pictures/menus/3.jpg'}
else if(page=='piece'){
document.getElementById('image_menu').src='pictures/menus/4.jpg'}
else if(page=='quad_moto'){
document.getElementById('image_menu').src='pictures/menus/5.jpg'}

var requete=null;


    if (window.XMLHttpRequest) {
        requete = new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
        requete = new ActiveXObject("Microsoft.XMLHTTP");
    }
    requete.open("GET", page+".php", false);
    requete.send(null);

   document.getElementById('conte').innerHTML=requete.responseText;
   this.xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=iso-8859-1"); 
   }
function add_to_compare(idc,idv){
var etat=document.getElementById(idc).checked; 

var requete=null;


    if (window.XMLHttpRequest) {
        requete = new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
        requete = new ActiveXObject("Microsoft.XMLHTTP");
    }
    requete.open("GET", "scripts/add_comparateur.php?id="+idv+"&etat="+etat, false);
    requete.send(null);

   if(requete.responseText!='')
   alert(requete.responseText);
}