function clear() {
  	this.defaultvalue = this.value;
	if (this._cleared) return
  	this.clear()
  	this._cleared = true
  }
  
  function unclear() {
  	this.value = this.defaultvalue;
	this._cleared = false 
  }
  
  Event.observe(window, 'load', function() {
  	var searchField = $('searchField');
  		Event.observe(searchField, 'focus', clear.bindAsEventListener(searchField));
	//	Event.observe(searchField, 'blur', unclear.bindAsEventListener(searchField));
  });