[OpenLayers-Users] how to get WMS feature attribute informations

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I'm running simple local mapping service based on PostGIS,GeoServer and
OpenLayers stack. and ms4w
geoserver = http://localhost:8080/

I was successful with creating map viewer and adding WMS layers. but I
wasn't successful with selecting  feature's of WMS layer n get information.
i want to select features in a polygon(regular draw circle) and generate
popup window with attribute/feature information (get information WMS
features) 
I have used several code examples for picking feature infor from wms layer
using WMSGetFeatureInofo function. but I cant get the WMS feature info.
PLEASE help me to solve my prob.



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