[Centos] Upgrading fom Fedora Core 1 to Centos - Reiserfs?

Hi,

I want to 'upgrade' from fedora core 1 to centos 3.1, but all of my 
partitions are reiserfs. The anaconda installer does not give the option 
  to use reiserfs in the disk partitioning portion, is there any way to 
change this? or should i use a different method to upgrade?

Tim.