;
(function($) {
	// @todo Document this.
	$.extend($, {placeholder: {
			browser_supported: function() {
				return this._supported !== undefined ?
						this._supported :
						(this._supported = !!('placeholder' in $('<input type="text">')[0]));
			},
			shim: function(opts) {
				var config = {
					color: '#888',
					cls: 'placeholder',
					selector: 'input[placeholder], textarea[placeholder]'
				};
				$.extend(config, opts);
				return !this.browser_supported() && $(config.selector)._placeholder_shim(config);
			}
		}});

	$.extend($.fn, {
		_placeholder_shim: function(config) {
			function calcPositionCss(target)
			{
				var op = $(target).offsetParent().offset();
				var ot = $(target).offset();

				return {
					top: ot.top - op.top,
					left: ot.left - op.left,
					width: $(target).width()
				};
			}
			function adjustToResizing(label) {
				var $target = label.data('target');
				if (typeof $target !== "undefined") {
					label.css(calcPositionCss($target));
					$(window).one("resize", function() {
						adjustToResizing(label);
					});
				}
			}
			return this.each(function() {
				var $this = $(this);

				if ($this.is(':visible')) {

					if ($this.data('placeholder')) {
						var $ol = $this.data('placeholder');
						$ol.css(calcPositionCss($this));
						return true;
					}

					var possible_line_height = {};
					if (!$this.is('textarea') && $this.css('height') != 'auto') {
						possible_line_height = {lineHeight: $this.css('height'), whiteSpace: 'nowrap'};
					}

					var ol = $('<label />')
							.text($this.attr('placeholder'))
							.addClass(config.cls)
							.css($.extend({
						position: 'absolute',
						display: 'inline',
						float: 'none',
						overflow: 'hidden',
						textAlign: 'left',
						color: config.color,
						cursor: 'text',
						paddingTop: $this.css('padding-top'),
						paddingRight: $this.css('padding-right'),
						paddingBottom: $this.css('padding-bottom'),
						paddingLeft: $this.css('padding-left'),
						fontSize: $this.css('font-size'),
						fontFamily: $this.css('font-family'),
						fontStyle: $this.css('font-style'),
						fontWeight: $this.css('font-weight'),
						textTransform: $this.css('text-transform'),
						backgroundColor: 'transparent',
						zIndex: 99
					}, possible_line_height))
							.css(calcPositionCss(this))
							.attr('for', this.id)
							.data('target', $this)
							.click(function() {
						$(this).data('target').focus();
					})
							.insertBefore(this);
					$this
							.data('placeholder', ol)
							.focus(function() {
						ol.hide();
					}).blur(function() {
						ol[$this.val().length ? 'hide' : 'show']();
					}).triggerHandler('blur');
					
					$(window).one("resize", function() {
						adjustToResizing(ol);
					});
				}
			});
		}
	});
})(jQuery);

jQuery(document).add(window).bind('ready load', function() {
	if (jQuery.placeholder) {
		jQuery.placeholder.shim();
	}
});