It's my $('#tester').offset(10,20); in a box
It's my $('#tester').offset(10,20, 'fast'); in a box
It's my $('#tester').offset('+=10','+=20'); in a box
It's my $('#tester').offset('+=5','-=30'); in a box
It's my $('#tester').offset($('#match').offset()); in a box
It's my $('#tester').offset($('#match').offset(), 200); in a box

Match Me!
My Top Offset
My Left Offset