Change listings in Grub

[Edwin McGuire]

Can I change to one listing of kernel choice on menu instead of 3 which I have. Thanks to Colin was able to change default OS this way,
 sudo gedit /etc/default/grub
 then
 sudo update-grub
I have6 lines of Linux kernels:

0        Ubuntu, Linux 2.6.31-22-Generic
1        Ubuntu, Linux 2.6.31-22-Generic (recovery mode)
2        Ubuntu, Linux 2.6.31-21-Generic
3        Ubuntu, Linux 2.6.31-21-Generic (recovery mode)
4        Ubuntu, Linux 2.6.31-14-Generic
5        Ubuntu, Linux 2.6.31-14-Generic (recovery mode)
6    #  memory test (memtest86+)
7        memory test (memtest86+,serial console 115200)
8    *   Microsoft Windows XP Professional 

*   now default
#  old default

can I delete lines 2-5.
then also change default # again to 4.
new would be:

0    Ubuntu, Linux 2.6.31-22-Generic
1    Ubuntu, Linux 2.6.31-22-Generic (recovery mode)
2    memory test (memtest86+)
3    memory test (memtest86+,serial console 115200)
4    Microsoft Windows XP Professional 

Am I on the right track.
Thanks Ed

Don't tell God how big your storm is,
Tell the storm how big your God is!
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