Boot options

[Linda]

I let 12.04 resize the partition and install next to 10.04.  
It said it would let you choose which to boot, but it 
doesn't, it just boots to 12.04. The partition with 10.04 
does exist as I used it to copy and reference files. What do 
I need to change to have boot options? Is this still done 
with Grub?  If so how do I get the grub menu to appear 
rather than booting straight into 12.04? I need to continue 
to boot to 10.04 with this machine until I solve the mgetty 
problem.
                     Linda