$.extend({
    BgImageTransitions: []
});

$.fn.extend({
    BgImageTransition: function(src, link, callback, options) {
        if (!src) { return $; }
        //copy css from the element to the helper element function
        function copyCSS(from, to) {
            $(['border-bottom-color', 'border-bottom-style', 'border-bottom-width', 'border-left-lolor',
            'border-left-style', 'border-left-width', 'border-right-color', 'border-right-style',
            'border-right-width', 'border-spacing', 'border-top-color', 'border-top-style',
            'border-top-width', 'bottom', 'height', 'left', 'margin-bottom', 'margin-left',
            'margin-right', 'margin-top', 'marker-offset', 'max-height', 'max-width', 'min-height',
            'min-width', 'opacity', 'outline-color', 'outline-offset', 'outline-width',
            'padding-bottom', 'padding-left', 'padding-right', 'padding-top', 'position', 'right',
            'top', 'width', 'z-index']).each(function(i, v) {
                $(to).css(v, $(from).css(v));
            });
        }

        //make sure there is a zIndex set - we will the helperElement to be *above* the original one
        if (!this.css('zIndex')) {
            this.css('zIndex', 1);
        }

        //default plugin settings
        var settings = $.extend({
            effect: { opacity: 'toggle' },
            duration: 'slow',
            easing: 'linear',
            callback: callback,
            helperElementId: this.attr('id') + '2',
            zindex: parseInt(this.css('zIndex'), 10) + 1
        }, options);

        //check the bgImageTransition array and see whether there is already a helperElement for the original one. Generate one, if not
        var helperElement = null;
        if (!$.BgImageTransitions[this.attr('id')]) {

            helperElement = this.clone();
            copyCSS(this, helperElement);
            helperElement.css('zIndex', settings.zindex);
            helperElement.css('display', 'none');
            helperElement.css('position', 'absolute');
            var eleOffset = $(this).offset();
            helperElement.css('top', eleOffset.top);
            helperElement.css('left', eleOffset.left);
            helperElement.attr('id', settings.helperElementId);
            helperElement.insertAfter(this);
            $.BgImageTransitions[this.attr('id')] = helperElement;
        }
        else {
            helperElement = $.BgImageTransitions[this.attr('id')];
        }

        //load the image file into cache first, so that we get a nice and fast load. Make the transition when the image has been loaded in cache
        var tempImage = new Image();

        $(tempImage).load(function() {
            var newImage = (helperElement.css('display') == 'block') ? $(this) : $(helperElement);

            newImage.css('backgroundImage', 'url(' + tempImage.src + ')');


            helperElement.click(function() {
                window.location = link;
            })

            helperElement.animate(settings.effect, settings.duration, settings.easing, settings.callback);
        });

        var eleOffset = $('#blaf').offset();
        helperElement.css('top', eleOffset.top);
        helperElement.css('left', eleOffset.left);
        tempImage.src = src;

        return $;
    }
});


function doSomething() {

    if ($.BgImageTransitions['blaf']) {
        var helperElement = $.BgImageTransitions['blaf'];
        var eleOffset = $('#blaf').offset();
        helperElement.css('top', eleOffset.top);
        helperElement.css('left', eleOffset.left);
    }
}
var resizeTimer = null;
$(window).bind('resize', function() {
    if (resizeTimer) {
        clearTimeout(resizeTimer);
    }
    resizeTimer = setTimeout(doSomething, 100);
});