Periodic (and automatic) craigslist ad posts...

Hello,

I've seen software that "sort of" automatically posts ads on craigslist. They always seem buggy or require too much human interaction.

Here's what I want to do...

1. I own a small computer repair business
2. I just want the ad/ads to automatically post every 1-2 days. Hopefully randomizing a little without me having to make a million different ads, but not looking like spam. I will have an image created, so it would be an html ad.

Any ideas?

Thanks!