Check if inserted 'http'

[orryun]

I have a profice field named: field6.
It contains a string with a URL, insereted by the user.

When I display that string, I want to add a link to that location.
The problem is, that if it doesn't include "http://" it doesn't work properly. (if the string is "blah.com", it will link to http://mydomain/blah.com)

How can I automtically add the "http://", if needed?


Thanks..