function showPlant(id) {
  var plant_box = document.getElementById('plant_box_'+id);
  var plant_li  = document.getElementById('plant_'+id);
  if (plant_box.style.display == 'block') {
    plant_box.style.display = 'none';
    plant_li.className = 'plant_title';
  } else {
    plant_box.style.display = 'block';
    plant_li.className = 'selected';
  }
}


var last_plant_id = new Array();
function showPlantPicture(id, pid) {
  var lpp = '';
  if ( lpp = document.getElementById('plant_picture_'+last_plant_id[pid])) {
    document.getElementById('plant_pic_num_'+last_plant_id[pid]).className = '';
    lpp.style.display = 'none';
  }
  document.getElementById('plant_picture_'+id).style.display = 'block';
  document.getElementById('plant_pic_num_'+id).className = 'selected';
  last_plant_id[pid] = id;
}


function letterFilter(letter) {
  document.getElementById('filter_letter').value = letter;
  document.getElementById('filter_name').value = '';
  document.filter.submit();
}