(function($) {
	$.fn.imagezoom = function(options) {
		var settings = {
			xzoom: 600,
			yzoom: 400,
			offset: 10,
			position: "btr",
			preload: 1
		};
		if(options) {
			$.extend(settings, options);
		}
		var noalt = '';
		var self = this;
		$(this).bind("mouseenter", function(ev) {
			var imageleft = $(this).offset().left;
			var imagetop = $(this).offset().top;
			var imagewidth = $(this).get(0).offsetwidth;
			var imageheight = $(this).get(0).offsetheight;
			var boxleft = $(this).parent().offset().left;
			var boxtop = $(this).parent().offset().top;
			var boxwidth = $(this).parent().width();
			var boxheight = $(this).parent().height();
			noalt = $(this).attr("alt");
			var bigimage = $(this).attr("rel");
			$(this).attr("alt", '');
			if($("div.zoomdiv").get().length == 0) {
				$(document.body).append("<div class='zoomdiv'><img class='bigimg' src='" + bigimage + "'/></div><div class='zoommask'> </div>");
			}
			if(settings.position == "btr") {
				if(boxleft + boxwidth + settings.offset + settings.xzoom > screen.width) {
					leftpos = boxleft - settings.offset - settings.xzoom;
				} else {
					leftpos = boxleft + boxwidth + settings.offset;
				}
			} else {
				leftpos = imageleft - settings.xzoom - settings.offset;
				if(leftpos < 0) {
					leftpos = imageleft + imagewidth + settings.offset;
				}
			}
			$("div.zoomdiv").css({
				top: boxtop,
				left: leftpos
			});
			$("div.zoomdiv").width(settings.xzoom);
			$("div.zoomdiv").height(settings.yzoom);
			$("div.zoomdiv").show();
			$(this).css('cursor', 'crosshair');
			$(document.body).mousemove(function(e) {
				mouse = new mouseevent(e);
				if(mouse.x < imageleft || mouse.x > imageleft + imagewidth || mouse.y < imagetop || mouse.y > imagetop + imageheight) {
					mouseoutimage();
					return;
				}
				var bigwidth = $(".bigimg").get(0).offsetwidth;
				var bigheight = $(".bigimg").get(0).offsetheight;
				var scaley = 'x';
				var scalex = 'y';
				if(isnan(scalex) | isnan(scaley)) {
					var scalex = (bigwidth / imagewidth);
					var scaley = (bigheight / imageheight);
					$("div.zoommask").width((settings.xzoom) / scalex - 200);
					$("div.zoommask").height((settings.yzoom) / scaley - 100);
					$("div.zoommask").css('visibility', 'visible');
				}
				xpos = mouse.x - $("div.zoommask").width() / 2;
				ypos = mouse.y - $("div.zoommask").height() / 2;
				xposs = mouse.x - $("div.zoommask").width() / 2 - imageleft;
				yposs = mouse.y - $("div.zoommask").height() / 2 - imagetop;
				xpos = (mouse.x - $("div.zoommask").width() / 2 < imageleft) ? imageleft : (mouse.x + $("div.zoommask").width() / 2 > imagewidth + imageleft) ? (imagewidth + imageleft - $("div.zoommask").width()) : xpos;
				ypos = (mouse.y - $("div.zoommask").height() / 2 < imagetop) ? imagetop : (mouse.y + $("div.zoommask").height() / 2 > imageheight + imagetop) ? (imageheight + imagetop - $("div.zoommask").height()) : ypos;
				$("div.zoommask").css({
					top: ypos,
					left: xpos
				});
				$("div.zoomdiv").get(0).scrollleft = xposs * scalex;
				$("div.zoomdiv").get(0).scrolltop = yposs * scaley;
			});
		});

		function mouseoutimage() {
			$(self).attr("alt", noalt);
			$(document.body).unbind("mousemove");
			$("div.zoommask").remove();
			$("div.zoomdiv").remove();
		}
		count = 0;
		if(settings.preload) {
			$('body').append("<div style='display:none;' class='jqpreload" + count + "'></div>");
			$(this).each(function() {
				var imagetopreload = $(this).attr("rel");
				var content = jquery('div.jqpreload' + count + '').html();
				jquery('div.jqpreload' + count + '').html(content + '<img src=\"' + imagetopreload + '\">');
			});
		}
	}
})(jquery);

function mouseevent(e) {
	this.x = e.pagex;
	this.y = e.pagey;
}