Selective Transparency with PS4

On Photoshop 4, when exporting images as GIF format with a transparent 
color, is there a way (or trick) to preserve a portion of the image to 
be non-transparent when that portion is the same color as the one you 
picked as transparent?  

For example, I have an image of a Mercedes with part of the roof being 
white.  I exported the image as GIF format from PS4 with white being the 
transparent color.  That means part of the roof becomes transparent 
also.  On that particular web page, I have a background color of white 
with pattern.  The pattern is showing through the roof of the Mercedes.  
You'll see what I mean by visiting:

http://members.xoom.com/eap/

I thought about painting the white part of the roof off-white.  But 
there is no off-white color in the web-safe palette.  I'd appreciate any 
help you can offer, even when its "CANNOT BE DONE".

-Collin


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