[OpenLayers-Users] Query problem

[Aypes2]

Dear all,

I just got a query problem. I have several overlays, and I want them to be
queryable when they are turned on (visible) only. But I found if I turn on
two or more overlays, only 1 layer can be queried and other visible overlays
give no result (empty template in mapfile). Here is my code:

map.events.register('click', map, function (e) {
    var oplayers = new Array( alayer.visibility, blayer.visibility,
clayer.visibility, dlayer.visibility, elayer.visibility, flayer.visibility);
    var mslayers = new Array("a","b","c","d","e","f");
    var i=0;
    for (i=0; i < 7; i++) {
    if ( oplayers[i] == true ) { 
    var url = "http://localhost/cgi-bin/mapserv.exe"
      + "?map=c:/ms4w/Apache/htdocs/mapfile.map" 
      + "&REQUEST=GetFeatureInfo"
      + "&VERSION=1.1.1"
      + "&EXCEPTIONS=application/vnd.ogc.se_xml"
      + "&BBOX=" 
      + map.getExtent().toBBOX()
      + "&X=" + e.xy.x
      + "&Y=" + e.xy.y
      + "&INFO_FORMAT=text/html"
      + "&QUERY_LAYERS=" + mslayers[i]
      + "&LAYERS=" + mslayers[i]
      + "&FEATURE_COUNT=1"
      + "&SRS=EPSG:4269"
      + "&STYLES="
      + "&WIDTH=" + map.size.w
      + "&HEIGHT=" + map.size.h;
        window.open(url,
                  "getfeatureinfo",
                  "location=0,status=0,scrollbars=1,width=600,height=400"
        );
      };
    }; 
  });
alayer,blayer,clayer,dlayer,elayer,flayer are names of layers defined in
html. (var alayer = ......)
a,b,c,d,e,f are the layer names of the mapfiles.

The only querable layer is the 'highest' one. For example, if I turn on
alayer and blayer, blayer can be queried but alayer cannot. If alayer,
blayer and flayer are on, only flayer can be queried. 

I find that the layer with higher variable i ([ oplayer[i] ]) would be
queried only. I know there is a function called WMSfeatureGetinfo but I
don't know how to use it. I just know it has queryVisible which can filter
the hidden layers, but error 'permission denied' always comes out when I
click on the query layer.

I prefer my method, and I think the logic of my code is okay but something
is wrong. Can anyone get idea about that?

Regards,
Aypes2
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