Use Silverlight version of excanvas if possible about canviz HOT 1 OPEN

ExplorerCanvas release 3 is out, and it does not contain the Silverlight 
version. When asked about this on the 
mailing list, the developers said this is because of some outstanding issues 
with the Silverlight script, and that 
they plan to merge the Silverlight and VML versions into a single script. So 
for Canviz we may not have to do 
anything but wait for this to happen.

http://groups.google.com/group/google-excanvas/browse_thread/thread/e2d9dc2ee588
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