jQuery.fn.fancyZoom = function(options){

	var options   = options || {};
	var directory = options && options.directory ? options.directory : '/tutorial/images/site/fancybox';
	var zooming   = false;

	if ($('#zoom').length == 0) {
		var ext = $.browser.msie ? 'gif' : 'png';
		var html = '<div id="zoom" style="display:none;"> \
		<table id="zoom_table" style="border-collapse:collapse; width:100%; height:100%;"> \
		<tbody> \
		<tr> \
		<td class="tl" style="background:url(' + directory + '/tl.' + ext + ') 0 0 no-repeat; width:20px; height:20px; overflow:hidden;" /> \
		<td class="tm" style="background:url(' + directory + '/tm.' + ext + ') 0 0 repeat-x; height:20px; overflow:hidden;" /> \
		<td class="tr" style="background:url(' + directory + '/tr.' + ext + ') 100% 0 no-repeat; width:20px; height:20px; overflow:hidden;" /> \
		</tr> \
		<tr> \
		<td class="ml" style="background:url(' + directory + '/ml.' + ext + ') 0 0 repeat-y; width:20px; overflow:hidden;" /> \
		<td class="mm" style="background:#fff; vertical-align:top; padding:10px;"> \
		<div id="zoom_content"> \
		</div> \
		</td> \
		<td class="mr" style="background:url(' + directory + '/mr.' + ext + ') 100% 0 repeat-y;  width:20px; overflow:hidden;" /> \
		</tr> \
		<tr> \
		<td class="bl" style="background:url(' + directory + '/bl.' + ext + ') 0 100% no-repeat; width:20px; height:20px; overflow:hidden;" /> \
		<td class="bm" style="background:url(' + directory + '/bm.' + ext + ') 0 100% repeat-x; height:20px; overflow:hidden;" /> \
		<td class="br" style="background:url(' + directory + '/br.' + ext + ') 100% 100% no-repeat; width:20px; height:20px; overflow:hidden;" /> \
		</tr> \
		</tbody> \
		</table> \
		<a href="#" title="Close" id="zoom_close" style="position:absolute; top:0; left:0;"> \
		<img src="' + directory + '/closebox.' + ext + '" alt="Close" style="border:none; margin:0; padding:0;" /> \
		</a> \
		</div>';

		$('body').append(html);

		$('html').click(function(e){if($(e.target).parents('#zoom:visible').length == 0) hide();});
		$(document).keyup(function(event){
			if (event.keyCode == 27 && $('#zoom:visible').length > 0) hide();
		});

		$('#zoom_close').click(hide);
	}

	var zoom          = $('#zoom');
	var zoom_table    = $('#zoom_table');
	var zoom_close    = $('#zoom_close');
	var zoom_content  = $('#zoom_content');
	var middle_row    = $('td.ml,td.mm,td.mr');

	this.each(function(i) {
		element = $(this).attr('href').replace(/(.*)(\#.*)/, "$2");
		$(element).hide();
		$(this).click(show);
	});

	return this;

	function show(e) {
		if (zooming) return false;
		zooming         = true;
		var content_div = $($(this).attr('href').replace(/(.*)(\#.*)/, "$2"));
		var zoom_width  = options.width;
		var zoom_height = options.height;

		var width       = window.innerWidth || (window.document.documentElement.clientWidth || window.document.body.clientWidth);
		var height      = window.innerHeight || (window.document.documentElement.clientHeight || window.document.body.clientHeight);
		var x           = window.pageXOffset || (window.document.documentElement.scrollLeft || window.document.body.scrollLeft);
		var y           = window.pageYOffset || (window.document.documentElement.scrollTop || window.document.body.scrollTop);
		var window_size = {'width':width, 'height':height, 'x':x, 'y':y}

		var width              = (zoom_width || content_div.width()) + 60;
		var height             = (zoom_height || content_div.height()) + 60;
		var d                  = window_size;

		// ensure that newTop is at least 0 so it doesn't hide close button
		var newTop             = Math.max((d.height/2) - (height/2) + y, 0);
		var newLeft            = (d.width/2) - (width/2);
		var curTop             = e.pageY;
		var curLeft            = e.pageX;

		zoom_close.attr('curTop', curTop);
		zoom_close.attr('curLeft', curLeft);
		zoom_close.attr('scaleImg', options.scaleImg ? 'true' : 'false');

		$('#zoom').hide().css({
			position	: 'absolute',
			top				: curTop + 'px',
			left			: curLeft + 'px',
			width     : '1px',
			height    : '1px'
		});

		fixBackgroundsForIE();
		zoom_close.hide();

		if (options.closeOnClick) {
			$('#zoom').click(hide);
		}

		if (options.scaleImg) {
			zoom_content.html(content_div.html());
			$('#zoom_content img').css('width', '100%');
		} else {
			zoom_content.html('');
		}

		$('#zoom').animate({
			top     : newTop + 'px',
			left    : newLeft + 'px',
			opacity : "show",
			width   : width,
			height  : height
		}, 500, null, function() {
			if (options.scaleImg != true) {
				zoom_content.html(content_div.html());
			}
			unfixBackgroundsForIE();
			zoom_close.show();
			zooming = false;
		})
		return false;
	}

	function hide() {
		if (zooming) return false;
		zooming         = true;
		$('#zoom').unbind('click');
		fixBackgroundsForIE();
		if (zoom_close.attr('scaleImg') != 'true') {
			zoom_content.html('');
		}
		zoom_close.hide();
		$('#zoom').animate({
			top     : zoom_close.attr('curTop') + 'px',
			left    : zoom_close.attr('curLeft') + 'px',
			opacity : "hide",
			width   : '1px',
			height  : '1px'
		}, 500, null, function() {
			if (zoom_close.attr('scaleImg') == 'true') {
				zoom_content.html('');
			}
			unfixBackgroundsForIE();
			zooming = false;
		});
		return false;
	}

	function switchBackgroundImagesTo(to) {
		$('#zoom_table td').each(function(i) {
			var bg = $(this).css('background-image').replace(/\.(png|gif|none)\"\)$/, '.' + to + '")');
			$(this).css('background-image', bg);
		});
		var close_img = zoom_close.children('img');
		var new_img = close_img.attr('src').replace(/\.(png|gif|none)$/, '.' + to);
		close_img.attr('src', new_img);
	}

	function fixBackgroundsForIE() {
		if ($.browser.msie && parseFloat($.browser.version) >= 7) {
			switchBackgroundImagesTo('gif');
		}
	}

	function unfixBackgroundsForIE() {
		if ($.browser.msie && $.browser.version >= 7) {
			switchBackgroundImagesTo('png'); 
		}
	}
}