Cannot change DATA object

[Sievers, Jason]

I am using version 4.8.3 of MapServer's CGI program.  I wish to change the
DATA object in a map file on the fly (via JavaScript).  I am able to change
objects like MINSCALE, MAXSCALE, TYPE, etc. with the syntax
&MAP_layername_object=myvalue.  However I cannot change the DATA object and
am not sure why.  Please let me know your thoughts.
 
 
Jason Sievers
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