jQuery clear on focus

gistfile1.js

;(function($) {
  $.fn.clearfocus = function() {
    return this.each(function() {
      var $field = $(this);
      var original_value = $field.val();

    	$field.focus(function() {
    		if($field.val() == original_value) $field.val("");
    	});

    	$field.blur(function() {
    		if($field.val() == "") $field.val(original_value);
    	});
    });
  }
})(jQuery);