function display_coffret(display_th1,display_th2,display_th3,display_th4,display_th5,display_th6){
    document.getElementById('coffret_th1_ul').style.display=display_th1;
    document.getElementById('coffret_th2_ul').style.display=display_th2;
    document.getElementById('coffret_th3_ul').style.display=display_th3;
    document.getElementById('coffret_th4_ul').style.display=display_th4;
    document.getElementById('coffret_th5_ul').style.display=display_th5;
    document.getElementById('coffret_th6_ul').style.display=display_th6; 
}