Added better description of navigation keys.

Added contact info.

[SVN r39712]

doc/contact_info.qbk

@@ -0,0 +1,17 @@
+
+[section:contact Contact Info and Support]
+
+The main support for this library is via the Boost mailing lists:
+
+* Use the 
+[@http://www.boost.org/more/mailing_lists.htm#users boost-user list] 
+for general support questions.
+* Use the 
+[@http://www.boost.org/more/mailing_lists.htm#main boost-developer list] 
+for discussion about implementation
+and or submission of extensions.
+
+You can also find JM at john - at - johnmaddock.co.uk and PAB at
+pbristow - at - hetp.u-net.com.
+
+[endsect]

doc/math.qbk

@@ -285,6 +285,7 @@ for these distributions.
 [section:history1 History and What's New]
 [history]
 [endsect]
+[include contact_info.qbk]
 
 [endsect] [/section:main_overview Overview]
 

doc/structure.qbk

@@ -1,6 +1,6 @@
 [section:navigation Navigation]
 
-Used in combination with the configured browser key (usually Alt), the
+Used in combination with the configured browser key, the
 following keys act as handy shortcuts for common navigation tasks.
 
 [h5 Shortcuts]
@@ -14,6 +14,23 @@ following keys act as handy shortcuts for common navigation tasks.
 [^[*u]] - Up
 ]
 
+The following table shows how to access these from common browsers:
+
+[table
+[[Browser][Access Method]]
+[[Internet Explorer]
+   [Alt+Key highlights the link only, so for example to move to the next topic
+   you would need "Alt+n" followed by "Enter".]]
+[[Firefox 2.0 and later][Alt+Shift+Key follows the link, so for example
+   "Alt+Shift+n" will take you to the next topic.]]
+[[Opera][Press Shift+Esc followed by the access key.]]
+[[Konqueror][Press and release the Ctrl key, followed by the access key]]
+]
+
+Some browsers also make these links available in their site-navigation
+toolbars: in Opera for example you can use Ctrl plus the left and right
+arrow keys to move between "next" and "previous" topics.
+
 [endsect]
 
 [section:directories Directory and File Structure]