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  // Vorschau immer anzeigen 
    var ENABLE_IMAGE_INSERT = true;  
     
    // Vorschau mit Mausover über Icon anzeigen 
    var ENABLE_PREVIEW_ICON = false; 

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        if (!isAmazon(href)) return preview;
        var isbn = getASIN(href);
        if (isbn != null) {
            if (isAmazonCOM(href)) return 'http://images.amazon.com/images/P/' + isbn + '.01.TZZZZZZZ.jpg';
            else if (isAmazonDE(href)) return 'http://images-eu.amazon.com/images/P/' + isbn + '.03.TZZZZZZZ.jpg';
            else if (isAmazonUK(href)) return 'http://images-eu.amazon.com/images/P/' + isbn + '.02.TZZZZZZZ.jpg';
            else if (isAmazonFR(href)) return 'http://images-eu.amazon.com/images/P/' + isbn + '.08.TZZZZZZZ.jpg';
        }
        return preview;
    }