shim for browsers that don't support the html5 placeholder attribute

kernel.placeholder.js

    (function () {
        $.support.placeholder = false;
        var test = document.createElement('input');
        if ('placeholder' in test) {
            $.support.placeholder = true;
            return function () { }
        } else {
            return function () {
                $(function () {
                    var active = document.activeElement;
                    $('form').delegate(':text', 'focus', function () {
                        var _placeholder = $(this).attr('placeholder'),
                        _val = $(this).val();
                        if (_placeholder !== undefined && _val == _placeholder) {
                            $(this).val('').removeClass('hasPlaceholder');
                        }
                    }).delegate(':text', 'blur', function () {
                        var _placeholder = $(this).attr('placeholder'),
                        _val = $(this).val();
                        if (_placeholder !== undefined && (_val == '' || _val == _placeholder)) {
                            $(this).val(_placeholder).addClass('hasPlaceholder');
                        }
                    }).submit(function () {
                        $(this).find('.hasPlaceholder').each(function () { $(this).val(''); });
                    });
                    $(':text').blur();
                    $(active).focus();
                });
            }
        }
    })()();