How to dual boot windows xp with windows 7?

i was wondering if anyone could help me dual boot windows xp with windows 7+

Its simple. just install xp on a different partition and it will be done. i am using quadruple boot with linux and windows. i have dual boot xp on same hdd 160 gb (windows 7 and xp) and i have no issues regarding.
you might lose windows 7 bootloader if you install xp after windows 7. it can be recovered as :-

Click on "Repair Your Computer" to gain access to the System Recovery window after booting with win 7 dvd.
Now choose "Command Prompt" in order to run the desired utility which is called "bootsect.exe". Bootsect is located inside the boot folder so change your directory to boot.
Now run
"bootrec.exe /nt60 C:\" (default position of your Windows partition is C:\).
After that, type
bootrec.exe /fixmbr
bootrec.exe /fixboot
bootrec.exe /rebuildbc

4. Restart your computer and your computer will surely run fine.
Important note : If your directory is not C:/ , then you can type bootrec /ScanOs to get full list of Os installed on your computer and select accordingly.