All menus are relative positioned. You can put the menu anywhere in the page. You can also adjust the position of submenu relative to the parent menu.

To control submenu position, use addSubmenu() function:

var menuProd=menuMgr.createMenu("product");
menuProd.addItem("1", "JavaScript", "", true, null, null);
menuProd.addSubmenu("1", "menujs", false, null, null, [25, 8]);
menuProd.addItem("2", "ASP/ASP.NET", "", true, null, null);
menuProd.addSubmenu("2", "menuasp", false, null, null, [25, 8]);
menuProd.addItem("3", "Java Desktop", "", true, null, null);
menuProd.addSubmenu("3", "menujavadesk", false, null, null, [25, 8]);
menuProd.addItem("4", "Java Web App", "", true, null, null);
menuProd.addSubmenu("4", "menujavaweb", false, null, null, [25, 8]);
menuProd.addItem("5", "Other", "", true, null, null);
menuProd.addSubmenu("5", "others", false, null, null, [25, 8]);