jQuery placeholder

$.fn.placeholder

(function($) {
    var t = function() {
    };
    "placeholder" in document.createElement("input") || (t = function() {
        var t = $(this), n = t.attr("placeholder");
        n && (t.focus(function() {
            this.value === n && (this.value = ""), t.removeClass("placeholder");
        }).blur(function() {
            this.value === "" && (this.value = n, t.addClass("placeholder"));
        }), t.val() === "" && t.addClass("placeholder"), t.val() || t.val(n));
    }), $.fn.placeholder = t;
})(jQuery);