/*
 * jQuery Plugin: clearOnFocus
 * Version 1.0
 *
 * Copyright (c) 2009 David Comeau (http://www.davecomeau.net)
 * Licensed jointly under the GPL and MIT licenses.
 *
 */

(function($) {
    $.fn.clearOnFocus = function() {
        
        function clearOnFocusFocus(event)
        {
            if($(this).val() == $(this).data('clearOnFocus'))
            {
                $(this).val('');
            }
        }
        
        function clearOnFocusBlur(event)
        {
            if($.trim($(this).val()) == '')
            {
                $(this).val($(this).data('clearOnFocus'));
            }
        }
        
        return this.each(function()
            {
                $(this).data('clearOnFocus', $(this).attr('value'));
                
                //  unbind any previous listeners
                $(this).unbind('focus', clearOnFocusFocus);
                $(this).unbind('blur', clearOnFocusBlur);
                
                //  bind listeners to the functions
                $(this).bind('focus', clearOnFocusFocus);
                $(this).bind('blur', clearOnFocusBlur);
            }
        );
    };
})(jQuery);