CGI Qlayer,Qstring variables usage

[rock well]

Hello all, 
          I was trying to query one of the layers from a shape file in the url, i am used map as the mode and gave the layer name for Qlayer, column name for Qitem and QString. Part of the URL looks like
   
  http://pathtomapserv.exe?MODE=map&LAYERS=layer1&QLAYER=layer1&QITEM=colname&QString=("colname=value")
   
  the map is displayed but it didnt filter the layer with the given querystring variables ....
   
  Is there something missing, can anyone suggest with something ...
   
  Thanks for your effort and time ....
  kris

 		
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