Enhancements in Interactive Scripting in CRM 7.1

Hi,

I have a requirement regarding defaulting the country (to be pulled from the employee master) based on the user language before the start of the script. The script design is already in place and I have to do some kind of enhancement to default the country at the start of the script. I need to know, how exactly I can do this enhancement and where I should write the code. Will it be ABAP coding or JAVA? Are there some kind of BADIs for this? I am getting enough information from google regarding the interactive script editor and script designing, but I am getting none on the coding part.