lost battery charge and wifi icon

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http://www.ubuntux.org – am using Ubuntu 9.10 on an acer aspire one. i have by mistake removed the icons for battery charge and the wifi from the pannel on my desktop and am unable to retrieve them. its a big problem cause i do not know how much charge i have left on my computer and i loose work because the comp shuts down whenever it is out of charge.. please help. (Distributions)