tie two toilet's vent

We have an existing bathroom that is approximately 15 ft from our new bathroom and we hope to be able to tie into the existing plumbing including the stink pipe. Will we be able to do this and it still be passed when inspected? What or how do you suggest this tie-in be accomplished?

The diameter of the vent pipe and the amount of new fixtures you are adding would determine if you can add more without increasing the diameter. All vent lines can be combined as long as you do it at or above the minimum height (nominally 42" above the floor, or 6" above the flood rim of the highest fixture - some places apparantly require 42" regardless). Each fixture should be vented individually.