Highlight Records that are in use by another user

Hi

I am trying to find some help to the following: I have created a multi-user
database that consists of 3 different business areas. Within each business
area there is a team of about 8 users that need to access about 1200 - 1500
records on a monthly basis.

What i want to do for each business area's work list, is create a function
that while one of the users is accessessing a specific record from within the
main record list, it will show the record that is being accessed in a
highlighted colour so that other
users that are in the main record list know not to access that record as it
is currently being worked on.

I have already put the Edit Record Lock on so that the warning message
appears. I have also set a condition on the form so that once the record has
been accessed it is then assigned to that user. Its just the initail issue
of users trying to access the same file that i'm trying to avoid, any help
would be greatly appreciated