i did a mistake i delete the internet icon from the panel!!

Don't worry, we can easily get it back. What you actually deleted was the notification area, where things like you network status and other things are put in forms of icons.

1) Right click on the panel at the place you want it back at
2) Click 'Add to Panel...'
3) In the window that pops up, into the text field at the top, type in 'notif'
4) This narrows down the results, and in the list now, you should see an entry saying -"Notification Area"
5) Double click on this entry, and it should appear on your panel. However the network icon might not come up yet, you may have to logout and logon again, but then it should definitely show.

Hope this Helps!