Help with code for making a link from text

[rh2004]

Hiya, I have an old vb version and I have added a private field so users can add a facebook url, what I have done is set it so the user can enter the ID so this is the number of the users profile,

I have set the allowed as only numbers and the number must be between 7-10 characters long.

What I want to do is make the link clickable but using the number the user enters in the box

Here is an image and my name for the field box is: field5

Can anyone tell me how to make it clickable to the users profile so they can add etc.

e.g:

http://www.facebook.com/home.php?#/p...p?id=888215715