Bang on.
Get the PIC Data Sheet for your device.
As BB says search the PDF for weak pullups.
And you'll find one or two registers to enable and set the weak pullups.
If you use b0 as the variable for your poke value then you conveniently set individual bits by name as bit3 for example.
I'll add just one thing; if you are trying to make a super-low-power design thern
forget them.
Or maybe westaust can look through the PIC Data Sheet for you?
He's generous - and sleeps less than hippy