Using batch to replace text in html script - cannot use "variables"

Since I don't know VB, nor do I have any of the required programs to even muddle through writing a script, I have chosen DOS batch for this task...

I have a demo CD that I want to give out to people.  It's an HTML using MS agent.  The voice for the character animation is stored in numerous WAV files.

In working with agent technology, there are no editors/creators that will support variable or incomplete file paths.

(I.E.: Simple logic would have the html code look like this:)

Char.Speak "", "\vocals\speech1.wav"
               or even
Char.Speak "", "%temp%\democd\vocals\speech1.wav"

The scripting engines REQUIRE a full path, and web paths such as "/vocals/etc.." don't work.  It has to actually read:

Char.Speak "", "D:\vocals\speech1.wav"

Herein lies the problem.  Not everyone's CD drive is letter D.  To get around this issue, I have decided to copy the contents of the CD into the temp folder of the user's computer,mostly because if we are to edit the HTML it cannot be on a CD.

Using the line:
FOR %%F IN (D E F G H I J K L M N O P Q R S T U V W X Y Z) DO (IF EXIST "%%F:\init.bat" (SET MYCD=%%F && CALL "%%F:\htmledit.cmd"))

(where init.bat is defined in AUTORUN to find the CDrom letter and copy contents to %temp%, and htmledit.cmd is the batch that will handle the rewriting of the html file) BTW, I found that command here, but alas cannot remember the original author

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Now that the variables are stored as %MYCD% and of course %TEMP%, how can I replace all 22 instances in the html file for the correct file path pointing to the users' temp folder?

(Also considering that not all people will have C: as their system drive.)
Or if there's an even simpler solution without having to do all this stuff, I'd be open to it.

Thanks in advance.