1.   \ScriptEnv{environment} {prefix} {postfix}
    This command defines a LaTeX environment
       \begin{environment}
body
\end{environment}
    which outputs its body in plain format, between the specified prefix and postfix.
2.   \ScriptCommand{\command} {prefix} {postfix}
    This command defines an environment
       \command
body
\Endcommand 
    which outputs its body in plain format, between the specified prefix and postfix.
3.   \JavaScript...\EndJavaScript