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I'd like to write a little script that will control the background color
of a form field based on whether or not the user is typing data into
said field.

If they start typing, I'd like the background color to be white.  But if
the field remains empty, I'd like the background color to be transparent
so the image shows through.

What is the syntax for transparency?  
fillColor = color.clear?
fillColor = color.blank?
fillColor = false?

Any ideas?

Thanks,

Mark

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