$(document).ready(function(){
    var id = 1;
    var maxid = 6;
    var delai=10000;
    
    
    setInterval(function(){
        $("#accueil").css('background-image','url("/images/diapo-'+id+'.jpg")');
        id++;
        if(id>maxid)id=1;
    },delai);
    
});