How to avoid keeping old kernels in dpkg/apt

[Pander <pander@users.sourceforge.net>]

Hi all,

When I build and install a new kernel I do this:

cd /usr/src/linux
make-kpkg clean
make-kpkg --append_to_version=-pbg4 kernel_image
cd /usr/src
dpkg -i kernel-image-2.6.10-pbg4_10.00.Custom_powerpc.deb

But after having installed a few kernels dpkg tells me this:

ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.4.21
ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.4.22
ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.6.10
ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.6.5-
ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.6.6-
ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.6.7-
ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.6.8.
ii  kernel-image-2 10.00.Custom   Linux kernel binary image for version 
2.6.9-

How do I get rid of these old entries in dpkg/apt OR how can I avoid 
this in the future with a different install command?

Thanks,

Pander