Bonjour,
j'ai trouvé un menu en javascript, http://demo.raibledesigns.com/struts...mlDropdown.jsp, dans mon site je met un tableau au centre Dans le quel je met toute mes page, lorsque j'ai inséré le menu, il s"insère trés bien dan la position ou je veux sauf lorsque je clique sur l'une des rubriques, il m'affiche les sous menu dans leur emplacement initial cad celui que j'ai montré plus haut, voilà le code :

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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/*
 
var currentMenu = null;
var currentSub = null;
 
if (!document.getElementById) {
    document.getElementById = function() { return null; }
}
 
function initializeMenu(menuId, actuatorId) {
    var menu = document.getElementById(menuId);
    var actuator = document.getElementById(actuatorId);
 
    if (menu == null || actuator == null) return;
        
    if (menu.className == "submenu") {
        initializeSubMenu(menuId, actuatorId);
        return;
    }
    
    actuator.onmouseover = function() {
        if (currentMenu) {
            currentMenu.style.visibility = "hidden";
            this.showMenu();
            
      	    if (currentSub != null) {
                currentSub.style.visibility = "hidden";
      	    }
	      }
    }
  
    actuator.onclick = function() {
        if (currentMenu == null) {
            this.showMenu();
        }
        else {
            currentMenu.style.visibility = "hidden";
            currentMenu = null;
        }
 
        return false;
    }
 
    actuator.showMenu = function() {
        menu.style.left = this.offsetLeft + "px";
        menu.style.top = this.offsetTop + this.offsetHeight + "px";
        currentMenu = menu;
        menu.style.visibility = "visible";
 
    }
}
 
function initializeSubMenu(menuId, actuatorId) {
    var menu = document.getElementById(menuId);
    var actuator = document.getElementById(actuatorId);
    if (menu == null || actuator == null) return;
    
    actuator.className += " subactuator";
    
    actuator.onmouseover = function() {
        if (currentSub) {
            currentSub.style.visibility = "hidden";
            this.showMenu();
        }
    }
    
    actuator.onclick = function() {
        if (currentSub == null) {
            this.showMenu();
        } else {
            currentSub.style.visibility = "hidden";
            currentSub = null;
        }
	      return false;
    }
    
    actuator.showMenu = function() {
        menu.style.left = 140 + "px";
        menu.style.top = this.offsetTop - 1 + "px";
        menu.style.visibility = "visible";
        currentSub = menu;
    }
}
 
function expandMenus() {
    // empty method - this is here b/c the ListDisplayer
    // calls this method for expanding menus and the list
    // type is determined by JavaScript, rather than Java
}
 
// This function loops through all the <ul>'s in the document and
// initializes the menus for them if they have menu classes
function initializeMenus() {
    var uls = document.getElementsByTagName("ul");
    for (i = 0; i < uls.length; i++) {
        if (uls[i].className == "menuList") {
            decorateMenu(uls[i]);
        }
    }
}
 
function decorateMenu(menu) {
    var links = menu.getElementsByTagName("a");
    var lists = document.getElementsByTagName("ul");
 
    var actuators = new Array();
    var nonActuators = new Array();
    // build an array of actuators
    for (i=0; i < links.length; i++) {
        if (links[i].className == "actuator") {
            actuators[actuators.length] = links[i];
        } else {
            nonActuators[nonActuators.length] = links[i];
        }
    }
 
    var menus = new Array();
    // build an array of menus
    for (i=0; i < lists.length; i++) {
        if (lists[i].className == "menu" || lists[i].className == "submenu") {
            menus[menus.length] = lists[i];
        }
    }
 
    // initialize actuators and menus (number should be the same)
    for (i=0; i < actuators.length; i++) {
        initializeMenu(menus[i].id, actuators[i].id);
    }
    
    // Begin custom code to remember last item clicked (with cookies)
    // add an onclick event to set a cookie on the non-actuators
    for (i=0; i < nonActuators.length; i++) {
        nonActuators[i].onclick=function() {
            setCookie(itemCookie,this.href);
        }
    }
}
 
/* You can call initializeMenus() manually from your JSP if this doesn't work.
 * Just put the following code after the last menu tag.
 * <script type="text/javascript">
 *     initializeMenus();
 * </script>
 */
window.onload = initializeMenus;

Merci pour votre aide !