[OpenLayers-Users] available WMS maps and troubleshooting

[Vika]

Hi, 

I am very new to OL. I am trying to load Topo Map layer according to a
sample usage http://trac.openlayers.org/wiki/AvailableWMSServices

 // create map options
    var options = {
        resolutions:
[0.46875,0.3515625,0.17578125,0.087890625,0.0439453125],
        controls: []
    };

 var map = new OpenLayers.Map('map', options);

  var drg = new OpenLayers.Layer.WMS("Topo Maps",
                "http://terraservice.net/ogcmap.ashx",
                {layers: "DRG"});
 map.addLayers([drg]);

However I get pink tile. The location of an image is
http://openlayers.org/dev/img/blank.gif
What does this mean ? How can I troubleshoot the problem ?

thanks

Victoria

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