Web Page crashes PowerMac GC user

A visitor to a small site I designed is reporting the following problem.
I've found a couple of validation problems, but nothing that should be
causing her computer to crash. Does anyone with a similar configuration have
any suggestions as to what the problem might be? Thanks in advance!

She says:
"After it loads it locks up my browser: Netscape 4.75 run on a PowerMac G3.
I have tried logging on three different times, and after each attempt I've
had to restart. I have not had this problem with any other website, and I
am often online as I maintain our company's site."

The page in question:
http://www.drafthorses.com/index.html

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