product thumbnail doesn't change

[kfir]

hey...

i have this page http://www.mycovers.co.il/mycovers/%D7%90%D7%99%D7%99%D7%A4%D7%95%D7%9F-5/%D7%9B%D7%99%D7%A1%D7%95%D7%99%D7%99%D7%9D-%D7%A0%D7%A8%D7%AA%D7%99%D7%A7%D7%99%D7%9D/%D7%9E%D7%92%D7%9F-%D7%9C%D7%90%D7%99%D7%99%D7%A4%D7%95%D7%9F-5-%D7%A9%D7%99%D7%91%D7%95%D7%A5-%D7%A0%D7%A6%D7%A0%D7%A6%D7%99%D7%9D-%D7%90%D7%95%D7%A4%D7%A0%D7%99-567a

and i upload 2 image to the product, but when i press on the image arrow the image doesnt change...

any one know why it doesnt work... ?

[jenkinhill]

Link gives a 404. http://forum.virtuemart.net/index.php?topic=79799.0