Applies placeholder attribute behavior in web browsers that don't support it

placeholder.css

input {
	color: #444;
	background: white;
}
input.placeholder {
	color: #aaa;
}

placeholder.js

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script>
$(document).ready(function() {
	// Applies placeholder attribute behavior in web browsers that don't support it
	if (!('placeholder' in document.createElement('input'))) {

		$('input[placeholder]').each(function() {
			$(this).data('originalText', $(this).val()).data('placeholder', $(this).attr("placeholder"));

			if (!$(this).data('originalText').length)
				$(this).val($(this).data("placeholder")).addClass('placeholder');
			
			
			$(this)
			.bind("focus", function () {
				if ($(this).val() === $(this).data('placeholder'))
					$(this).val("").removeClass('placeholder');
			})
			.bind("blur", function () {
				if (!$(this).val().length)
					$(this).val($(this).data('placeholder')).addClass('placeholder');
			})
			.parents("form").bind("submit", function () {
				// Empties the placeholder text at form submit if it hasn't changed
				if ($(this).val() === $(this).data('placeholder')) 
					$(this).val("").removeClass('placeholder');
			});
		});

		// Clear at window reload to avoid it stored in autocomplete
		$(window).bind("unload", function () {
			$('input[placeholder]').each(function(index) {
				if ($(this).val() === $(this).data('placeholder'))
					$(this).val("");
			});
		});
	}
});
</script>