Encrypted Password Generator

I do not fully understand the program JavaScript Kit Encrypted Password Generator: http://www.javascriptkit.com/epassword/index.htm

We have 2 files in a directory:
- the protected page (with password xxxxx)
- the entrance page (the protected page renamed to xxxxx.htm )

How to make the protected page with password xxxxx ??

Much simpler:-

<p>Enter your password:- <input type ="text" size = "12" onblur = "goPage(this)"></p>

<script type = "text/javascript">
function goPage(which) {
var page = which.value + ".html";
window.location = page;
}
</script>