I am sure some of you guys have been confused in the past about the SWF versioning and which version to use when targeting Flash Player or AIR.
Romil in the past posted a little table with the history. I decided to give it a little update that you can then bookmark.
We will have this posted as an official reference on livedocs soon, but for now here it is!

JavaScript version
Relation with ECMAScript
JavaScript 1.1ECMA-262 - Edition 1 is based on JavaScript 1.1.
JavaScript 1.2ECMA-262 was not complete when JavaScript 1.2 was released. JavaScript 1.2 is not fully compatible with ECMA-262 - Edition 1.
JavaScript 1.3JavaScript 1.3 is fully compatible with ECMA-262 Edition 1. JavaScript 1.3 resolved the inconsistencies that JavaScript 1.2 had with ECMA-262 while keeping all the additional features of JavaScript 1.2 except == and != which were changed to conform with ECMA-262.
JavaScript 1.4JavaScript 1.4 is fully compatible with ECMA-262 Edition 1. The third version of the ECMAScript specification was not finalized when JavaScript 1.4 was released.
JavaScript 1.5JavaScript 1.5 is fully compatible with ECMA-262 Edition 3.