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To open a full featured mibbit chat window with your preferred irc server/channel(s) presented in the connection form you can add a query string like so:
 http://www.mibbit.com/?server=irc.freenode.com&channel=%23ch1,%23ch2,%23ch3 ...
or if your channel is located on irc.mibbit.com:
 <a href="https://www.mibbit.com/?pass=yourPW&nick=yourNick&channel=%23yourCh">link to Chat
 </a>(choose a nick and click on [connect])
Supported (optional) "GET" parameters:
* server
* channel - you even can submit a comma separated channel list (see example)
* pass 
* nick - if empty a random nick like "mib_3Zh5F4tz" will be presented

Later ("soon") the embedded [[widget]] version will support foreign servers as well.