what kind of 'card' /usb does your janome take? how many cards do you have?
ETA: oops, i see that you want them on your PC
so you would need a brother card reader, right?
do you know anyone locally that has the brother card reader? they can save them for you to a USB or CD. then you can use a free converter to convert the PES to JEF. here is a link to free software
http://www.myembroideryhaven.com/samples.html