Installing Office,then using SYSPREP

Okay, basically at work I'm trying to create an image. Now, I know how to do this using sysprep, but my question relates to installing Office. okay, I need to know how to create I guess a quiet install of Office, so that I don't use the product key, then use SYSPREP to create the image. So when I use this image on other systems, Office will already be installed and I just click on it, and then have to input the product key. I haven't figured out how to install Office this way. I hope this makes sense and someone can help me out. Thanks!

Hi Todo,
I am using Office 2000 (SR1) on XP system. after full install of the office (among other usefull utils like acrobat , 7zip, irfan and antivirus). I am doing Sysprer and than later Ghost.
The computer never asked for a serial for the office...

Cheers,
Gabriel Levi