Installing FC3 alongside another distro

[Andy Elvey <andy elvey paradise net nz>]

Hi everyone -
   I'm a first-timer here and have a question about installing FC3 
alongside another distro.
 At the moment, I'm running Mepis Linux, and I'm keen to install FC3 as 
well.

  What I'm wondering is -  if I try to install FC3, will it overwrite 
the current bootloader, or will the FC3 bootloader just "append" itself 
to what's already there?  ( I believe Mepis uses the Grub bootloader). 
 At the moment, I have Grub in the master boot-record.  So, if I put 
FC3's bootloader elsewhere, will it still be possible for me to access 
both distros?

 Very many thanks for your time and comments! 
 - Andy