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$amount_of_keys = keys %upload;

...
# print qq(<a href="url#.html></a>); }  }

keys 1-20  would print url1.html
keys 21-40 would print url2.html
keys 41-60 would print url3.html
keys 61-80 would print url4.html (even though we don't have 80 images,
+ we have a surplus and still need to generate a url for it).