Creating email template using custom field | Type Url

Creating email template using custom field | Type Url

I'm trying to add a custom field to my email template with the type set to URL
 
The available modules to choose from are
Accounts
Conatcts
User
Vendor
Organisation
 
Only fields from  the folloing modules show when added to the email template
Contact
Vendor
Organisation
 
I created the URL custome field under contacts and then added the field to the email
the contents of the field showed
the link was not usable and had to do a cut and paste into the browser
 
What can I do to make this work
a: in the Accounts Module
b: make the link clickable from within the email
 
thanks for your help in advance