There is NO need to convert them m8, just download a copy of the 'ImportPlayer Light' (that's what I use for my PAL games), I assume you're in the US so get the US version.
Sadly many people think it's a bootdisk and have no idea what this image does and they tend to waste lots of time on making lousy conversions with ++++ty pal4u - a complete waste !
Just burn that to a CDR and bootup with it, change the video mode to NTSC and stick in your PAL game - it'll be full screen w/ proper gridfix
The downside is you will need an internal modchip to use it as a double swap bootcd may not work.
Get it here:
http://www.megagames.com/psx/psx_utils_bootcd.shtml