To add an icon to the toolbar, right click on the panel and choose 'unlock widgets'.
Then open the menu, right-click on a programme icon and choose 'add to panel'. The one you deleted is a kind of quickstart widget which groups a number of starters. You would have had to go to the settings of the widget to eliminate the starter for Konquerer. Not at the machine so I can't tell you the name of that widget now....
hth anway
EDIT: there you got it, Just17 drew quicker again...
