DRW dealing with null values in hyperlink fields

I am trying to figure out how to eliminate an underscore with a hyperlink to
my home page from appearing on .asp pages when the value is null. Here's an
example. Look for the underscores on the left side of the body of the page
(white section).

http://www.sharingweb.org/orgdetail....%2D +Abington

In the database I have a URL field and an email field, but these are often
not populated. When the field is blank like that, I get these underscores
with the links. I'd be grateful for any suggestions. I'm using the database
results wizard in FrontPage 2003.
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Thank you,

John Garvey