This program is mandated by Section 5 of the Toxics Substances Control Act (TSCA). The New Chemicals Program functions as a gatekeeper which can identify conditions-up to and including a ban on production-to be placed on the use of a new chemical before it is entered into commerce.
Currently, the newest version is MS Word 2010. Same with all the other different MS applications (PowerPoint, Excel, etc.)
JavaScript is a evolving language and there are often new versions of it that are released. As browsers are updated, they start to support these new versions. At the time of this writing, the newest version of JavaScript is/was 1.6. Most browsers don't support JavaScript 1.6, however. Namely, Internet Explorer doesn't support JS1.6, not even the newest IE7 beta.