Just had a look at some recruitment sites for ..em.. inspiration!
Good point about splitting the screen (
http://www.griffinpersonnel.ie).
Incentives / competitions are planned for both visitor groups (
Irish Jobs - Recruitment Ireland Recruiter Services are doing this, I must fill in their survey, I've a party coming up).
Others are using tabs. Cookies record their preference for future visits which might work well for my project.
Thanks lads!