hs.registerOverlay({
        html: '<div class="closebutton" onclick="return hs.close(this)" title="Close"></div>',
        position: 'top right',
        fade: 2 // fading the semi-transparent overlay looks bad in IE
    });

    hs.wrapperClassName = 'borderless';
    hs.graphicsDir = 'highslide/graphics/';
    hs.align = 'center';
    hs.transitions = ['expand', 'crossfade'];
    hs.outlineType = 'rounded-white';
    hs.fadeInOut = true;
    hs.showCredits = false; 
    hs.numberPosition = 'caption';
    hs.dimmingOpacity = 0.75;