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In Firefox (2 or 3), make sure the "Bookmarks Toolbar" is enabled. The
following link shows what the Toolbar looks like in an older version
of Firefox:

http://mozilla.gunnars.net/firefox_bookmarks_tutorial.html#Bookmark_T...

If the Toolbar is not enabled, right-click on or near the Home button,
and make sure "Bookmarks Toolbar" is checked. Next, navigate to
http://vispedia.stanford.edu and look for the "Visualize This!"
bookmarklet button. Drag this button to Bookmarks Toolbar and you're
all done!

To use the bookmarklet, navigate to a Wikipedia page and click on the
button in your Toolbar. Note that the bookmarklet does not yet
function outside of the English version of Wikipedia at the moment.

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In Internet Explorer 7, first make sure the "Links" bar is enabled. To
check, right-click on the View menu item and make sure the "Links"
list item is checked.

Next, navigate to http://vispedia.stanford.edu and look for the
"Visualize This!" bookmarklet button. Right-click this button, and
click on "Add to Favorites". A security warning may pop up. Answer
"Yes" to trust the bookmarklet.

When the "Add a Favorite" menu item shows up, tell Internet Explorer
to add it to "Links" rather than "Favorites". You can do so by
clicking on the drop-down menu labeled "Create in:" in this dialog
box. To finish installation, click "Add" and you're all done!

To use the bookmarklet, navigate to a Wikipedia page and click on the
button in your Toolbar. Note that the bookmarklet does not yet
function outside of the English version of Wikipedia at the moment.

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In Safari, first make sure the "Bookmarks Bar" is enabled. To toggle
this, click on the View menu--the first item should read "Hide
Bookmarks Bar" if the Bar is already visible.

Next, navigate to http://vispedia.stanford.edu and look for the
"Visualize This!" bookmarklet button. Drag this button to Bookmarks
Bar. Safari will ask you to name the bookmark. Click OK, and you're
all done!