[Plugin: Portfolio Slideshow] Safari problem

Hello I´m using portfolio slideshow in a website I´m developing for a client, using it in some pages. I am very happy with this plugin but the client told me in Mac / Safari they were having problems with its visualization and menu navigation (i can´t see the problem since I´m using PC (Explorer / Mozilla) and it´s working perfectly This is the link to the page in which it´s being used. Any idea?
By the way, thanks for this plugin I think it´s great!