Hi,

This is my understanding:

The only problem with using jump links is if you are using your directory as a reciprocal link directory. Many people use reciprocal links to increase the page ranks of both sites and if you are using jump links then this isn't fair because the link in your directory isn't counted towards the pagerank of the site you are linking to. However, it will not damage the pagerank of the site. I think that the purpose of most directories is to send traffic to the sites concerned rather than to increase their page rank, so in the vast majority of cases this isn't an issue. It all depends who is using your directory and why.

Laura.