[OpenLayers-Users] Adding Aditional parameters to WFS request?

[Saka Royban]

Hi all
I'm using Mapserver + OpenLayers. Now i wanna have a dynamic layer using variable substitution feature available in Mapserver (Is there any other solution?). I'm using following code: 

                    layer3 = new OpenLayers.Layer.Vector("Neighborhoods passed", {
                    strategies: [new OpenLayers.Strategy.Fixed()],
                    protocol: new OpenLayers.Protocol.WFS({
                        url:  "http://localhost/cgi-bin/mapserv.exe?map=/ms4w/apps/ms101/htdocs/ms101.map&service=wfs",
                        featureType: "subway_stations2",
                                                //featureNS: "http://mapserver.gis.umn.edu/mapserver",  
                                                //geometryName: "msGeometry",
                                                //featurePrefix: "ms",
                                                srsName: "EPSG:26918",     // Projection to be returned data in it.
                                                //maxFeatures: "300",          // maxFeatures to be returned.
                                                version: "1.1.0",
                                                route: '6'
                                            }),                        
                         });

'route' parameter is defined in Data parameter of mapfile and i'm sure it works (I've tested this via GET request and it returns a correct GML). But in don't know how to say to openlayers to add this additional parameter to request. Adding "route: '6'" to the last line before ending parenthesis also doesn't work.

Any idea? Is it possible at all?
or any better way to meet the same goal? 

Regards
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