A couple of days ago I have updated joomla at ver 1.7 and as a consequence I needed the new version of Art Sexy Lightbox.
I contacted the support and they answered in a while, sending me the new version.
Before using Art Sexy Lightbox I have tried different free extensions but all of them had problems (mainly caused by my cheap hosting). The only perfect one was Art Sexy Lightbox!
Thank you, Artetics!