Password Protect the Entry Page

Imagine that on the back-end of a Website you have created a graphics 
gallery - maybe 10 consecutive pages - with the starting (entry) page named 
something like: www.mysite.com/entry.htm.  There is no linkage whatsoever 
to this back-end page from index.htm.  What is the best method/resource to 
use to password protect the first page of the gallery?  I am not a 
programmer.  Perhaps there are some "cut and paste" js or other options.  I 
once used a java applet but it was many years ago and I assume 
newer/better/simpler client-side options are available - maybe 
not.  Anyway, how would you password protect and where might I find the 
code or program to create the code?

TIA, Ralph Rasmussen 

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