function sb_library_click(thisId) {
 /** Prevent text selection */
 thisId.onselectstart = function () { return false; };
 thisId.onmousedown   = function () { return false; };


 var ul = thisId.nextSibling;

 if (!ul) {
  return;
 }
 if (thisId.className == 'category') {
  thisId.className = 'categoryOn';
  ul.style.display = '';
 }
 else {
  thisId.className = 'category';
  ul.style.display = 'none';
 }
}