Adobe After Effect Timeline Only Shows Frames Not Seconds

Hello all im Currently learning some After Effects but since a short while my timeline only show Frames not Seconds anymore can somebody please help to get it show Seconds again
Answer #1
http://help.adobe.com/en_US/AfterEffects/9.0/WS4ABD6729-8645-442d-AE7D-FAB64EDFCC4Fa.html
next time please use google