Uninstall Ubuntu dualboot?

I recently installed Ubuntu linux Intrepid Ibex on my PC as a dual boot with WinXP, but it just hasn't worked out well, so I want to uninstall just Ubuntu and leave XP alone(and resize my partition to give xp its space). I have looked breifly at some topics but they all seem to need your WinXp install disks to reinstate XP loader. I read that just formatting the linux partition would leave Ubuntu's loader and eff things up. Is there a way I can uninstall Ubuntu and go back to the way it was before it was installed without the damn XP disk?