Rollovers - images don't preload - why?

I'm preparing a site, using rollovers produced from Macromedia Fireworks3.  
It's the first time I've done rollovers that way, and to tell the truth, it 
all looks like gobbledegook to me.  In the past I've been able to understand 
the javascript written by these apps, but in this case, its totally 
impenetrable for me.

And it's not working right.  I hope someone who knows more about javascript 
than I can tell me what's wrong

The images are swapping ok, but the mouseover images aren't preloading.  The 
page is going to the site to get the images as the mouse goes over it.  SO 
it's not swapping fast.

Can anyone tell me why?

The (partly built) page is at http://www.bluegrass.org.au

Cheers,
Mike Kear
AFP Web Development
Windsor, NSW, Australia
http://www.afp.zip.com.au

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