I don't have this machine, but probably you can either do a blind hem (depending on where you want the finished seam - hems most obviously) or there also should be an overedge stitch. I have a very old Singer (about 30 years old) and even it has an overedge stitch, and I also have a 20 year old Janone, which has both a blind hem capacity and also an overedge stitch. So for sure a newer janome should be able to do either of these.
Or you could just sew the seam as per usual, then overcast the edges with a zig zag.
French seams are very easy (on a straight edge), and look nice, especially on shirts. It is worthwhile taking the time to do them on shirts and things like that IMO.
ETÄ: An over edge stitch still won't be the same as an overlocked seam though (it looks kind of like a blanket stitch). If you have trouble with fabric fraying best to do a french seam. Or zig zag the edge, which is better than the overlocked stitch I think in regards to preventing fraying. Or pinking the edges might help.
This post has been edited by SarahM72: 31/12/2012, 07:15 PM