resize my home partition

hi i;m only 3 days old n linux so execuse me if i use windows expresions
i install linux ubuntu 8.10 with windows xp
i install linux on partition of 10 gb space
i start downloading updates and so on untill me free disk space on file system partion 80mb
i used partion magic to encrease the space of the partition i used to install linux i increase it to 25 gb
linux dosent feel this increase and the free space still 80 mb
how to make linux ubuntu 8.10 feel the new desk space

resize with gparted

I recommend booting from the ubuntu LiveCD. Then go to System->administration->Partition Editor. then you can resize your root or home partition.