HTML5 Placeholder Fallback with jQuery

HTML5-placeholder-fallback.js

$(document).ready(function() {
    if (!("placeholder" in document.createElement("input"))) {
        $("input[placeholder]").each(function() {
            var val = $(this).attr("placeholder");
            if (this.value == "") {
                this.value = val;
            }
            $(this).focus(function() {
                if (this.value == val) {
                    this.value = "";
                }
            }).blur(function() {
                if ($.trim(this.value) == "") {
                    this.value = val;
                }
            })
        });

        // Clear default placeholder values on form submit
        $('form').submit(function() {
            $(this).find("input[placeholder]").each(function() {
                if (this.value == $(this).attr("placeholder")) {
                    this.value = "";
                }
            });
        });
    }
});