Getting the mouse position on a gui?

What I need is to get the position of a mouse on a gui, not on the general screen.

You can sort of think of this as the screen being a town, the gui being a house, and the mouse being a person in that house that wants to know its position in the house. The house can be of any size, and so can the town.

I would need to get this from my mouse input.

Its simple,

frame.InputBegan:connect(function(input)
	local x=input.Position.X-board.AbsolutePosition.X
	print(x)
end)

This gets the distance from the start of the gui, and prints it.