I agree with Everly, too. However, I don't know that I'd just leave a gap completely unexplained on the resume. When I was a hiring manager, if I saw a large gap of more than a year with neither an explanation nor other relevent activities to fill the gap on the cover letter or resume, I was more likely to put it in the "other" pile.
If you were on a school board or did something with added non-home responsibility, that should definitely go on your resume under the "other activities"-type section. In your cover letter, you can also talk about the types of accomplishments you had in the last 5 years and prior to staying home that would correlate to the position you're applying for.
Perhaps while you're looking for a job, take a class or two at the local community college to brush up on skills and such to make yourself more marketable.
I'm sure I'll be facing this same challenge in some years if I decide to re-enter the workforce--since I just left it 2 years ago, I've got a little time to figure my future out!