The transcoder Lee suggested will indeed do the trick, but be ready for what you may consider some possible issues. Overscan being the biggest one that CRT users complain about as well as blurry text. Most CRT based HDTVs do not really have dot pitch to reproduce HD resolutions even though they are sold as HDTVs. I would try for a resolution of 960x540 for your display, it may work. Also it is important to set the refresh to 60hz, not optimum.
Check out:
Hooking Up A PC to A HDTV