Your sidebar is in the page
sidebar and should contain something like this:
{{navi>mynavigation}}
Then you create another page called
mynavigation which should contain your navigation:
* [[wiki:linux|Linux]]
* [[wiki:linux:lamp|LAMP Applications]]
* [[wiki:linux:ldap|Open LDAP]]
* [[wiki:linux:mail|Postfix/Webmail]]
* [[wiki:linux:other|Other Applications]]
* [[wiki:linux:tips]]
* [[wiki:windows|Windows]]
* [[wiki:windows:tips]]
* [[wiki:work|Work Related]]
* [[wiki:work:GLE|Great Lakes Electric]]
* [[wiki:work:unix]]
* [[wiki:work:db|Database]]
* [[wiki:work:db:oracle|Oracle]
* [[wiki:work:db:db2|DB2UDB]]
* [[wiki:work:db:mysql|MySQL]]
* [[wiki:work:shell|Shell Scripts]]