function displayCate(cate){
  if(cate == 'cateAlbum'){
    cateOther = 'cateAlpha';
  }else{
    cateOther = 'cateAlbum';
  }
  if($('#'+cateOther).css('display') != 'none'){
    $('#'+cateOther).slideUp('slow', function(){$('#'+cate).slideDown('slow');});
  }else{
    $('#'+cate).slideToggle('slow');
  }
}