An easier approach is to add two columns. LockedBy and LockedOn. When a user begins an edit, lock the record recording the ID and the Time. When they commit remove the lock. Don't let anyone edit the record if it has a lock, or let them see who locked it when and force remove the lock. This way you can also expire locks that are X minutes old, or when a users session ends, remove all there locks. I've used this approach before and it works rather well.
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Eric Hodges
$_='y==QAe=e?y==QG@>@?iy==QVq?f?=a@iG?=QQ=Q?9';
s/(.)/ord($1)-50/eigs;tr/6123457/- \/|\\\_\n/;print;
