[OpenLayers-Users] geocoding problem

[vrbikdan]

Hi all,
I'm trying to add geogoding to my map. I found example here: 
http://openlayers.org/dev/examples/openls.html
http://openlayers.org/dev/examples/openls.html  but when I try to add code
to my map is result: Cannot read property 'documentElement' of null and this
is result even if I copy whole code from example. But in example page
everythink works, so where should be a problem. My code is here:
        function vypisAdresu() {
            var queryString = document.vyhledaniAdresy.adresa.value;
            OpenLayers.Request.POST({
                url:
"http://www.openrouteservice.org/php/OpenLSLUS_Geocode.php",
                scope: this,
                failure: this.requestFailure,
                success: this.requestSuccess,
                headers: {"Content-Type":
"application/x-www-form-urlencoded"},
                data: "FreeFormAdress=" + encodeURIComponent(queryString) +
"&MaxResponse=1"
            });
        }
        function requestSuccess(response) {
            var format = new OpenLayers.Format.XLS();
            var output = format.read(response.responseXML);
            if (output.responseLists[0]) {
                var geometry = output.responseLists[0].features[0].geometry;
                var foundPosition = new OpenLayers.LonLat(geometry.x,
geometry.y).transform(
                        new OpenLayers.Projection("EPSG:4326"),
                        map.getProjectionObject()
                        );
                map.setCenter(foundPosition, 16);
            } else {
                alert("Sorry, no address found");
            }
        }
        function requestFailure(response) {
            alert("An error occurred while communicating with the OpenLS
service. Please try again.");
        }

And I have configured proxy.cgi in the same folder and in code like this:
OpenLayers.ProxyHost = "proxy.cgi?url=";

I used to nominatim for geocoding, but problem was, that it works only in
Chrome and FF, and IE and Opera has problem with request so I found this
example.

Thanks for help
Dan

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