function dd(obj){
    if(document.getElementById){
      document.getElementById(obj).style.display=='none'?document.getElementById(obj).style.display='':document.getElementById(obj).style.display='none'
    }
    else if(document.all){
      document.all(obj).style.display=='none'?document.all(obj).style.display='':document.all(obj).style.display='none'
    }
    else if(document.layers){
      document.layers[obj].display=='none'?document.layers[obj].display='':document.layers[obj].display='none'
    }
  }


function disp(id1, id2, id3){
	if(document.all){
		OBJ1 = document.all(id1).style;
		OBJ2 = document.all(id2).style;
		OBJ3 = document.all(id3).style;
	}
	else if(document.getElementById){
		OBJ1 = document.getElementById(id1).style;
		OBJ2 = document.getElementById(id2).style;
		OBJ3 = document.getElementById(id3).style;
	}

	OBJ1.display = '';
	OBJ2.display = 'none';
	OBJ3.display = 'none';
}