How do I remove http:// default in new users profiles?

Hi everyone. I need a little help with my new blog. I want users to be able to register and use my forums and post comments. I have been able to set that up with no trouble, I am only having trouble with one thing, when a users register for the site the profile defaults with “http://” in their website field, I understand why it does that, so people don’t forget to put it there, unfortunately since that text is there all users show up as if they have a web page, you hover over their name and it shows their web page being “http://” needless to say that wont work.

Is there any way to remove that text from being default in their profiles?

I am not too sure if I explained this very well, let me know if you all need any more information and if you all can help! Thanks.