Ta vazba není [have a look on] ale [have a
look] where? (at something that's written) [on the whiteboard].
[Have a look + předložka] on the whiteboard,
under the table, in
the cupboard, behind the settee, down the toilet, through the
window, between the books, etc.
A: I can't find my keys, do you know where they are? B: Have a look
on the table, that's where I last saw them.
A: I can't understand the grammar here. Can you help me? B: Have a look
on Help for English. They've got the answer to (almost )
everything!
A: I can't remember when my birthday is. Can you help me? B: Have a look
on your driving licence. You'll find the date there.
A: Gosh this beer must be strong. I've only drunk five and I'm already
feeling tipsy. B: Have a look on the label. It'll tell you how strong
it is.