Hi Pavan,
If you are using the AJAX framework page the user can simply drag the tabs and it will automatically be saved in the personalization.
user should:
1. place mouse over the role (in the top left corner you will see a triangle).
2. place mouse over triangle and, push and hold down mouse button.
3. drag the mouse to the navigation place where you want it to be (notice black line).
4. leave the mouse button.
Now the order of the tabs are saved in the personalization for that user only.
Hope this is what you meant.
BR,
Saar