this.set(this.toArray().concat(classNameToAdd).join(' ')); 
this.set($A(this).concat(classNameToAdd).join(' ')); 
  add: function(classNameToAdd) {    if (this.include(classNameToAdd)) return;    this.set(this.toArray().concat(classNameToAdd).join(' '));  },
4999	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/4999/15b6168787a6a25fd1fbbc41a3a5227b899071a9/prototype.js/clean/wp-includes/js/scriptaculous/prototype.js