deep trouble on my site

Hi everyone,
I think have a problem with my site located on http://www.nyczone.net
i say think because it depends, one time it appears correctly, and the next 
time no ...

the page appears correctly all the time with IE5
the problem is with NN (use the 4.7), some time, i don't know why it seems 
there's a problem
but when i look the page on my hard disk, see any problems

so if someone can check with NN, it would be great

Thanks

Julien Gre, a member of the group NYCZone
Our mission is to help people to create their own effective web site
Advices & hosting available and free on http://www.nyczone.net

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