javascript Global ScriptEngine( ), ScriptEngineBuildVersion( ), ScriptEngineMajorVersion( ), ScriptEngineMinorVersion( )

These Internet Explorer-only functions reveal information about the scripting engine (JScript, VBScript, or VBA) being used to invoke the method and which version of that engine is installed. For JScript, the version refers to the version of the Jscript.dll file installed among the browser's support files. The major version is the part of the version number to the left of the version decimal point; the minor version is the part to the right of the decimal point. More granular than that is the internal build number that Microsoft uses to keep track of release generations during development and through release.