jquery placeholder fallback

placeholder

(function ($) {
	$.support.placeholder = false;
	var test = document.createElement('input');
	if ('placeholder' in test) $.support.placeholder = true;
	$.fn.placeholderFallback = function () {
		if (!$.support.placeholder) {
			var active = document.activeElement;
			this.focus(
				function () {
					if ($(this).attr('placeholder') != '' && $(this).val() == $(this).attr('placeholder')) {
						$(this).val('').removeClass('hasPlaceholder');
					}
				}).blur(
				function () {
					if ($(this).attr('placeholder') != '' && ($(this).val() == '' || $(this).val() == $(this).attr('placeholder'))) {
						$(this).val($(this).attr('placeholder')).addClass('hasPlaceholder');
					}
				}).blur();
			$(active).focus();
			$('form').submit(function () {
				$(this).find('.hasPlaceholder').each(function () {
					$(this).val('');
				});
			});
		}
	}
})(jQuery);