How to get URL in worflow email action

Hi all,

I need to create a workflow that sending email, in the message body I don't want to set hardcode URL. Does anyone know how to do it?

Ex:

My current message body:

"https://crmondemand.com/OnDemand/user/AccountDetail?ocTitle=%%%[<AccountName>]

I want to do as following.

%%%hostname%%%/OnDemand/user/AccountDetail?ocTitle=%%%[<AccountName>]

Thanks,

Du