function ShowMenu(num, menu, max)
        {
                //starting at one, loop through until the number chosen by the user
                for(i = 1; i <= max; i++){
                        //add number onto end of menu
                        var menu2 = menu + i;
                        //change visibility to block, or 'visible'
                        document.getElementById(menu2).style.display = 'none';
                }
                document.getElementById(menu+num).style.display = 'block';       
        }