var menu_combo = 'hide';

function mClick(ID){
  if(document[ID] == 'show'){
    hide(ID);
  }else{
    show(ID);
  }
}
function show(ID){

  if(document.getElementById){ var obj= document.getElementById(ID); }
  else if(document.all){ var obj = document.all.ID; }
  else if(document.layers){ var obj = document.ID; }
  obj.className = "show";
  document[ID] = 'show';
}
function hide(ID){
  if(document.getElementById){ var obj= document.getElementById(ID); }
  else if(document.all){ var obj = document.all.ID; }
  else if(document.layers){ var obj = document.ID; }
  obj.className = "hide";
  document[ID] = 'hide';
}