How to setup dual-boot with WindowsXP and Ubuntu on separte hard-drives already installed

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http://askubuntu.com – I have Windows Professional installed on the 1st hard drive with the NTFS file system. I've just installed UBUNTU 11.10 on a second hard drive but didn't setup the dual boot during installation because I was confused that I might by accident, install on the wrong drive. So before the installation of UBUNTU, I dis-connected the 1st hard drive with WindowsXP from the power supply just to be safe. So now I've been trying every thing to setup dual boot. WHAT CAN I DO TO SETUP DUAL BOOT? (HowTos)