fix INSTALLDIR use in common.php
fix INSTALLDIR use in common.php

I was using $INSTALLDIR instead of INSTALLDIR

darcs-hash:20080517173424-84dde-6fe6df2e710f1a19db97a93682f41cf01034952f.gz

frankmullenger/centralflirt,frankmullenger/centralflirt,frankmullenger/centralflirt