Graceful degradation for browser not supporting the placeholder attribute

graceful-placeholders.js

var setupPlaceholders = function () {
	if (typeof document.createElement('input').placeholder !== 'undefined') {
		return;
	}

	var clearPlaceholder = function () {
		var input = jQuery(this);
		if (input.hasClass('placeholder')) {
			input.val('');
			input.removeClass('placeholder');
		}
	};

	var onBlur = function () {
		var input = jQuery(this);
		if (input.val() === '') {
			input.val(input.attr('placeholder'));
			input.addClass('placeholder');
		}
	};

	jQuery('input[placeholder]').each(function () {
		var input = jQuery(this);
		input.val(jthis.attr('placeholder'));
		input.addClass('placeholder');
		input.focus(clearPlaceholder);
		input.blur(onBlur);

		input.closest('form').submit(function () {
			clearPlaceholder.apply(input);
		});
	});
};