//**************************************************************
// modified jQZoom plugin //
//**************************************************************

(function($){
	$.fn.jqueryzoom = function(options){

			var settings = {
		xzoom: 500,
		yzoom: 330,
		left:0,
		offset: 10,
		position: "right",
		preload:1,
		lens:1,
		style_width:"50%"
			};
			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("jqimg");

	            $(this).children("img").attr("alt",'');

			    if($("div.zoomdiv").get().length == 0){
				    $(this).append("<div class='zoomdiv'><img class='bigimg' src='"+bigimage+"'/></div>");
				    $(this).append("<div class='jqZoomPup'> </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").width(settings.xzoom);
			    $("div.zoomdiv").height(settings.yzoom);
			    $("div.zoomdiv").css({left: settings.left+'px'});
	            $("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);
						
						//pokud by byl zoom vesi nez obrazek
						if(imageWidth<(settings.xzoom/scalex))
							$("div.jqZoomPup").width(imageWidth);
						else
							$("div.jqZoomPup").width((settings.xzoom)/scalex );
							
						if(imageHeight<(settings.yzoom/scaley))
							$("div.jqZoomPup").height(imageHeight);
						else
							$("div.jqZoomPup").height((settings.yzoom)/scaley);


	                    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+"'></div>");

			$(this).each(function(){
		        var imagetopreload= $(this).children("img").attr("jqimg");
		        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;
}