dbox question

[Sam Young]

I am trying to set up a mapserver application using dbox at the following 
url: http//:www.trailweb.net
The error message I get out of the Firefox error console is:

Error: this.treeLegend has no properties
Source File: http://www.trailweb.net/src/javascript/mapserver/dlegend.js
Line: 56

Does anyone have any suggestions on how to resolve this?

Thanks,

Sam

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