Install the SEOquake plugin for firefox or chrome. Don't know if they have one for IE. There's a feature inside that plugin that highlights no-follow links on the pages you visit. If the links in a page are no-follow, then chances are you'll also get a no-follow backlink when you make a post.

if you want to check your website backlinks. it is Do-follow or not or any site back links, you can use Do-follow extension in Google chrome. it is very simple to install and use.

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If you're using Firefox, my favorite extension is the "SearchStatus" extension.

Use the No DO Follow plugin for firefox, very handy!