  New millimeter wave observations of the molecular absorption line system in
the gravitational lens to PKS1830-211 at z=0.88582 is presented.
Self-calibrated interferometer data shows unequivocally that the previously
detected absorption component is associated with the gravitationally lensed
south-west image of the background source. A second absorption line of
HCO+(2-1) at z=0.88582 is detected. This component is shifted in velocity by
-147 km/s relative to the main absorption line, and is shown to be associated
with the north-east image. These two absorption lines are used to constrain the
mass of the lensing galaxy. Upper limits to absorption and emission lines from
the possible absorption system at z=0.1927, seen in 21cm HI by Lovell et al,
are reported.
