thanks you all
martinibuster <Never trade links with anyone who approaches you for links >
because my website is a new one, pr is just 0. if i don't apply for exchanging link, i am not sure anyone will approch me for links. which pr is suitable for my request a link trade? now i just apply for it at somesites pr 2-4, i think others with high pr will not approve my submit. and after my site get high pr, if i should delete some low pr links?
sorry, i don't what is white bar? i read the recommend thread and learn more, but it's too long, i didn't find the answer. ;)