I have a simple gadget that I wrote with several parameters
(UserPrefs) and I'd like to create an "Add to iGoogle" button.

According to the developer documentation, you simply take the "Add to
iGoogle" url and append the user prefs to the end.

For example, if I have a gadget with URL:

http://mycompany.com/feed_reader.xml

with the following defined in the XML file:

<UserPref name="url" display_name="Feed URL" default_value="http://
blogs.adobe.com/dev_center/index.rdf" required="true" />
<UserPref name="timer" display_name="Refresh (seconds)"
default_value="300" />
<UserPref name="count" display_name="Item Count" default_value="5" />
<UserPref name="dates" display_name="Show Date" datatype="bool"
default_value="true" />
<UserPref name="content" display_name="Show Content" datatype="bool"
default_value="true" />
Then the base URL for the "Add to iGoogle" button becomes:

http://www.google.com/ig/adde?moduleurl=http://mycompany.com/feed_reader.xml

... which is simple enough. However, the developer documentation says
(and the "Share this gadget" function in iGoogle when the "Send my
settings for this gadget" box is checked), that you can include the
UserPrefs as part of the URL. In fact, when I do just that, I get a
URL in the form:

http://www.google.com/ig/adde?moduleurl=http://mycompany.com/feed_reader.xml&up_url=http://content.nejm.org/rss/recent.xml&up_timer=3600&up_count=10&up_dates=true&up_content=true

The problem is that if I follow that link, rather than get a gadget
added with the correct settings, I get a gadget where all the settings
are the defaults instead of the supplied values.

Any ideas?

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