I recall a good JavaScript manual that once resided here.
That link seems broken now (2005 April).
Searching with Google for “Core JavaScript Reference” just now revealed the following links which seem much like what I remember.
They are all about version 1.5:
2009 July
JavaScript pages seem to have a short life span.
This
seems to be much of the content of a now defunct Netscape site.
Core JavaScript Guide
The Guide is about the language proper.
JavaScript Examples
Mozilla
Core JavaScript Reference
The Reference is about those builtin facilities assumed available in JavaScript.
Synchronet (Frames)
library.n0i.net
Byteshift(?)
PHPRomania