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

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