/*
 * jqzoom evolution 1.0.2 - javascript image magnifier
 *
 * copyright (c) engineer renzi marco(www.mind-projects.it)
 *
 * $date: 12-12-2008
 *
 * changelog: remove html warning change by wu,yang 2009-12-24 11:20
 *  
 */
(function($) {
	$.fn.jqueryzoom = function(options) {
		var settings = {
			xzoom: 200,
			//zoomed width default width
			yzoom: 200,
			//zoomed div default width
			offset: 10,
			//zoomed div default offset
			position: "right",
			//zoomed div default position,offset position is to the right of the image
			lens: 1,
			//zooming lens over the image,by default is 1;
			preload: 1
		};
		if (options) {
			$.extend(settings, options);
		}
		var noalt = '';
		$(this).hover(function() {
			var imageleft = $(this).offset().left;
			var imagetop = $(this).offset().top;
			var imagewidth = $(this).children('img').get(0).offsetwidth;
			var imageheight = $(this).children('img').get(0).offsetheight;
			noalt = $(this).children("img").attr("alt");
			var bigimage = $(this).children("img").attr("longdesc");
			$(this).children("img").attr("alt", '');
			if ($("div.zoomdiv").get().length == 0) {
				$(this).after("<div class='zoomdiv'><img class='bigimg' src='" + bigimage + "'/></div>");
				$(this).append("<div class='jqzoompup'>&nbsp;</div>");
			}
			if (settings.position == "right") {
				if (imageleft + imagewidth + settings.offset + settings.xzoom > screen.width) {
					leftpos = imageleft - settings.offset - settings.xzoom;
				} else {
					leftpos = imageleft + imagewidth + settings.offset;
				}
			} else {
				leftpos = imageleft - settings.xzoom - settings.offset;
				if (leftpos < 0) {
					leftpos = imageleft + imagewidth + settings.offset;
				}
			}
			$("div.zoomdiv").css({
				top: imagetop,
				left: leftpos
			});
			$("div.zoomdiv").width(settings.xzoom);
			$("div.zoomdiv").height(settings.yzoom);
			$("div.zoomdiv").show();
			if (!settings.lens) {
				$(this).css('cursor', 'crosshair');
			}
			$(document.body).mousemove(function(e) {
				mouse = new mouseevent(e);
				/*$("div.jqzoompup").hide();*/
				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.jqzoompup").width((settings.xzoom) / (scalex * 1));
					$("div.jqzoompup").height((settings.yzoom) / (scaley * 1));
					if (settings.lens) {
						$("div.jqzoompup").css('visibility', 'visible');
					}
				}
				xpos = mouse.x - $("div.jqzoompup").width() / 2 - imageleft;
				ypos = mouse.y - $("div.jqzoompup").height() / 2 - imagetop;
				if (settings.lens) {
					xpos = (mouse.x - $("div.jqzoompup").width() / 2 < imageleft) ? 0 : (mouse.x + $("div.jqzoompup").width() / 2 > imagewidth + imageleft) ? (imagewidth - $("div.jqzoompup").width() - 2) : xpos;
					ypos = (mouse.y - $("div.jqzoompup").height() / 2 < imagetop) ? 0 : (mouse.y + $("div.jqzoompup").height() / 2 > imageheight + imagetop) ? (imageheight - $("div.jqzoompup").height() - 2) : ypos;
				}
				if (settings.lens) {
					$("div.jqzoompup").css({
						top: ypos,
						left: xpos
					});
				}
				scrolly = ypos;
				$("div.zoomdiv").get(0).scrolltop = scrolly * scaley;
				scrollx = xpos;
				$("div.zoomdiv").get(0).scrollleft = (scrollx) * scalex;
			});
		},
		function() {
			$(this).children("img").attr("alt", noalt);
			$(document.body).unbind("mousemove");
			if (settings.lens) {
				$("div.jqzoompup").remove();
			}
			$("div.zoomdiv").remove();
		});
		count = 0;
		if (settings.preload) {
			$('body').append("<div style='display:none;' class='jqpreload" + count + "'>mymyty</div>");
			$(this).each(function() {
				var imagetopreload = $(this).children("img").attr("longdesc");
				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;
}