I looked at section 2 Sky in Experimental, and I don't see the code printed on your HTML pages. I just made a small album with your latest version of Blue++. Here is the javascript I added to the slide.htt:
<script language="javascript" type="text/javascript">pageSetup();</script>
<!-- preload next image -->
<ja:if exists="next">
<script language="JavaScript" type="text/javascript">
next_image = new Image();
next_image.src = "<%= next.get("fileName")%>";
</script>
</ja:if>
</body>
</html>
And here is the code I got on the generated HTML of a slide page made with v2.2:
<script language="javascript" type="text/javascript">pageSetup();</script>
<!-- preload next image -->
<script language="JavaScript" type="text/javascript">
next_image = new Image();
next_image.src = "rap61.jpg";
</script>
</body>
</html>
The next _image.src was correctly generated for each slide, except the last one, of course. Your code didn't look the same as the above, if it was the nextimagepreload script in the head. When I went to the French site, I could hear my browser clicking as it loaded the next page in the background. I didn't hear that with your page, so that implies it wasn't preloading. It wasn't excessively slow in any case, but apparently it didn't preload.
