Thank you @pmario That works. I will do more testing when I get more free time. Since I use a wide screen monitor, rightside is very useful.
On a sidenote, do you remember this two tiddler story solution you created for me - I hacked it to open the second tiddler in a second column (using shiraz multicolumn storyriver CSS) - Check this wiki - https://sidetabs-wiki.tiddlyhost.com/