/*
 * Lazy Load - jQuery plugin for lazy loading images
 *
 * Copyright (c) 2007-2009 Mika Tuupola
 *
 * Licensed under the MIT license:
 *   http://www.opensource.org/licenses/mit-license.php
 *
 * Project home:
 *   http://www.appelsiini.net/projects/lazyload
 *
 * Version:  1.5.0
 *
 */
(function($) {

    $.fn.lazyload = function(options) {
        var settings = {
            threshold    : 0,
            failurelimit : 0,
			maxwidth	 : 0,
            event        : "scroll",
            effect       : "show",
            container    : window
        };
                
        if(options) {
            $.extend(settings, options);
        }

        /* Fire one scroll event per scroll. Not one scroll event per image. */
        var elements = this;
        if ("scroll" == settings.event) {
            $(settings.container).bind("scroll", function(event) {
                
                var counter = 0;
                elements.each(function() {
                    if ($.abovethetop(this, settings) ||
                        $.leftofbegin(this, settings)) {
                            /* Nothing. */
                    } else if (!$.belowthefold(this, settings) &&
                        !$.rightoffold(this, settings)) {
                            $(this).trigger("appear");
                    } else {
                        if (counter++ > settings.failurelimit) {
                            return false;
                        }
                    }
                });
                /* Remove image from array so it is not looped next time. */
                var temp = $.grep(elements, function(element) {
                    return !element.loaded;
                });
                elements = $(temp);
            });
        }
        
        this.each(function() {
            var self = this;
            if(this.width>50 && this.height>50)
			{
   			 /* Save original only if it is not defined in HTML. */
			    if (undefined == $(self).attr("original")) {
			        $(self).attr("original", $(self).attr("src"));     
			    }

			    if ("scroll" != settings.event || 
			            undefined == $(self).attr("src") || 
			            settings.placeholder == $(self).attr("src") || 
			            ($.abovethetop(self, settings) ||
			             $.leftofbegin(self, settings) || 
			             $.belowthefold(self, settings) || 
			             $.rightoffold(self, settings) )) {
                
			        if (settings.placeholder) {
			            $(self).attr("src", settings.placeholder);      
			        } else {
			            $(self).removeAttr("src");
			        }
			        self.loaded = false;

			    } else {
			        self.loaded = true;
			    }
    
			if(settings.maxwidth!=0)
			{
			if(self.width>settings.maxwidth)
			{
			$(self).attr("width",settings.maxwidth).css("border-bottom","1px #FFF solid");
			}
			}

			    /* When appear is triggered load original image. */
			    $(self).one("appear", function() {
			        if (!this.loaded) {
			            $("<img />")
			                .bind("load", function() {
			                    $(self)
			                        .hide()
			                        .attr("src", $(self).attr("original"))
			                        [settings.effect](settings.effectspeed);
			                    self.loaded = true;

			if(settings.maxwidth!=0)
			{
			if(this.width>settings.maxwidth)
			{
				$(self).attr("width",settings.maxwidth).css("border-bottom","1px #FFF solid");
			}
			}

			                })
			                .attr("src", $(self).attr("original"));
			        };
			    });

			    /* When wanted event is triggered load original image */
			    /* by triggering appear.                              */
			    if ("scroll" != settings.event) {
			        $(self).bind(settings.event, function(event) {
			            if (!self.loaded) {
			                $(self).trigger("appear");
			            }
			        });
			    }

			}
        });
        
        /* Force initial check if images should appear. */
        $(settings.container).trigger(settings.event);
        
        return this;

    };

    /* Convenience methods in jQuery namespace.           */
    /* Use as  $.belowthefold(element, {threshold : 100, container : window}) */

    $.belowthefold = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).height() + $(window).scrollTop();
        } else {
            var fold = $(settings.container).offset().top + $(settings.container).height();
        }
        return fold <= $(element).offset().top - settings.threshold;
    };
    
    $.rightoffold = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).width() + $(window).scrollLeft();
        } else {
            var fold = $(settings.container).offset().left + $(settings.container).width();
        }
        return fold <= $(element).offset().left - settings.threshold;
    };
        
    $.abovethetop = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).scrollTop();
        } else {
            var fold = $(settings.container).offset().top;
        }
        return fold >= $(element).offset().top + settings.threshold  + $(element).height();
    };
    
    $.leftofbegin = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).scrollLeft();
        } else {
            var fold = $(settings.container).offset().left;
        }
        return fold >= $(element).offset().left + settings.threshold + $(element).width();
    };
    /* Custom selectors for your convenience.   */
    /* Use as $("img:below-the-fold").something() */

    $.extend($.expr[':'], {
        "below-the-fold" : "$.belowthefold(a, {threshold : 0, container: window})",
        "above-the-fold" : "!$.belowthefold(a, {threshold : 0, container: window})",
        "right-of-fold"  : "$.rightoffold(a, {threshold : 0, container: window})",
        "left-of-fold"   : "!$.rightoffold(a, {threshold : 0, container: window})"
    });
    
})(jQuery);