Avatar link hack !!HELP!!

[concept]

I made a hack that allow people to click on avatars as a link to there home page only problem is the people who have avatars and don;t have sites bring up blank pages is there a way to do it so it does not use the link effect if the person does not have a site??? anyoen with any ideas please post away

[concept]

i do know that if the member does not have anything filled out for there website it reloads my site but when you register its set to http:// . ithere a way i can change it to say nothing and where owuld i look?

[concept]

anyone have any ideas on how to make it so a person with now web site the code removes the <a href="blah"> </a>