Better called Ecma Script.
Not related to Ja Va, the name was chosen as a marketing ploy by Net Scape.
Douglas Crockford calls it The World's Most Misunderstood Programming Language which blames ECMA for lots of problems.
Over Lib popup library http://www.bosrup.com/web/overlib/
rules for maintainability
supports the Xml Http Request object - which slides into AJAX