[NTG-context] \useURL problem.

If I use e.g.: \useURL[a][http://www.creativemindspress.com]\from[a] it works but if I use \useURL[a][http://www.creativemindspress.com/bkpckg.htm ]\from[a] I get an error message. Yet the second form is a valid url. Any suggestions? -- John Culleton