Popup image not working at first.

[stevemcl]

The popup image (clicking on a product image to enlarge) isn't working when a user first comes to my website, after the user navigates around a little bit, then

it starts working.

 

http://www.jumping-shoes.com/catalog/popup_image.php?pID=48

 

am I missing some initialization someplace???

 

thanks,

steve