HTML5 Placeholder fallback.

placeholder.js

function hasPlaceholderSupport() {
  var input = document.createElement('input');
  return ('placeholder' in input);
}

(function () {
    if (hasPlaceholderSupport() === false) {
        $('input[placeholder]').each(function () {
            var $this = $(this), placeholder = $this.attr('placeholder');
            $this.val(placeholder).focus(function() {
                if ($this.val() === placeholder) {
                    $this.val('');
                }
            }).blur(function () {
                if ($this.val() === '') {
                    $this.val(placeholder);
                }
            });
        });
    }
})(jQuery);