menu_status = new Array();

function showHide(theid){
    if (document.getElementById) {
    var switch_id = document.getElementById(theid);

        if(menu_status[theid] != 'list-show') {
           switch_id.className = 'list-show';
           menu_status[theid] = 'list-show';
        }else{
           switch_id.className = 'list-hide';
           menu_status[theid] = 'list-hide';
        }
    }
}