Macro to Create Signature

Hello,
I am working on multiple projects.
I have my Email signature like:
------------------------
Joe Doe
xxxx Manager
MyCompany Inc.
---------------------------

I need a macro for creating project specific signatures.
1. When I run that Macro, I want a Pop-Up Input Box window to ask for the Project Name.
2. I want to type in the project name in the Pop-Up Input Box which would be for example: Project101

3. I want the macro to create a New Signature like:
------------------------
Joe Doe
Project101 Manager
MyCompany Inc.
---------------------------
(the xxxx is replaced byProject101)


Please advise .
Thanks