i want to update that there is great difference between "no follow" and "nofollow". no follow works similar as dofollow.
I do not think it is possible to know the quality of links offered by a site unless you open it in a window..... Regards, RightMan
Link building can be crafty. Sometimes it’s hard to figure out where to jump in. There are enough dumb options and strategies to make an SEO cry tears of pain. If you’re not employing a vendor to handle it, the bottom line is that link building is time consuming, but there is no matter how you approach it. There are tools that help you determine good link partners through different ‘guesstimation’ algos, but if you’re not using them you need to come up with your own plan of attack. A less efficient way to find links is to Google sites with related themes and content and try to negotiate links with them manually. This manual part of link building does give you a lot of SEO control over the link partners and what the link looks like. However, I like to optimize this approach with a few tricks. First set Your Goals and Research Your Keywords, And after finding Link Partners which Sites Do Not Have No Follow.
i still don't know how to find with google query. So i just use http://www.fastblogfinder.com/downloads and http://www.inlineseo.com/dofollowdiver
ok but iam still confused my question is if i have 1000 back links on my page then how to identify each link manually whether its is nofollow or dofollow without helping of any tool