Windows XP >FF2 &FF3>Click the invitation email. The Log-In button is shown pulled to left.

Windows XP >FF2 &FF3

Invite a member to join a group. Now copy the invitation link and paste in FF browser.

Noted that the Log-in button is shown pulled to the left side. [ In IE7, the Login button is shown in the middle.]

Also, noted that without entering user name and password, if the user click Login button, "No user name given " message will be displayed and the user is taken to the curriki "http://beta.curriki.org/xwiki/bin/loginsubmit/XWiki/XWikiLogin" page . Here the log-in button is shown at the middle.