Slideshow with Shadow

Great! extension bought.... but I have another little problem I hope you can help me...
As you can see here www.granatomobili.joomlahost.it/ slideshow is not centered on the page.... I tryed different position (16,17,18,19 you can see it from file attached) and also to put it directly in the article (current situation) but remain alligned on the left..... what wrong? sorry but I don't know how to solve this. The page have no columns....

you have given a fixed width of 730px, give the valeu "auto" for the width in the module options