booting linux on different partitions

[nix <nikhil@roc.co.in>]

hi guys
    well i have 2 partitions (hda2,hda5) with 2 redhat flavor 7.2 and 8.0 
respectively (both ext3). when i configure grub making one partition root 
then the other partition doesnt boot.  it seems that i cannot define 2 root 
partitions in my grub. and i cannot use "chainloader" keyword since there is 
no bootloader at the start of these partitions. is there any way around, any 
command i can use in grub or lilo to do this?
please help.
nix.
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