Problem with photo popup

My photo gallery has been working fine, but all of a sudden the photos started opening up on a new page, although I would like them to open in a slideshow.
I've checked the settings, and the image caption (including removing the captions altogether). Makes no difference.
During the preview the slideshow works fine, but once uploaded they open on a new page. (see here: http://algarseco.com/photogallery%20general.htm).
I attached the page in question.
Any help would be appreciated, I am completely stumped... :p

Hi Malou,

Perhaps the uploading (publishing) to your host was not fully completed and has broken the highslide.js

I have published your page here to test:

► http://talkgraphics.magix.net/public/webdesigner/malou/

For me this works fine, can you check please?

And welcome to the forums :)

Yes, it seems to be working fine with yours. I really don't understand why it's not working on my site; I have uploaded the gallery page several times over the last few days, and still have the same problem.
Then again, it works fine in the preview...
May thanks for the welcome, I find this forum very helpful.