highlighting one polygon

[Alexspringer at aol.com]

Using mapserver cgi, I need this feature and cannot determine how to 
implement:

I want to enable the user to type into a box on the screen the value (say 
Smith) of a field (say NAME) that is believed to exist in a dbf record 
corresponding to a shape file.  I then want the display to show that layer 
and have highlighted the polygon corresponding to the dbf record with some 
special color that I have set.  

Can anyone help me with a sample of what the code would appear like in the 
.map and .htm to enable this feature?  Thank you.