Index: trunk/ippTasks/diff.pro
===================================================================
--- trunk/ippTasks/diff.pro	(revision 24098)
+++ trunk/ippTasks/diff.pro	(revision 24174)
@@ -146,4 +146,5 @@
     book getword diffSkyfile $pageName skycell_id -var SKYCELL_ID
     book getword diffSkyfile $pageName camera -var CAMERA
+    book getword diffSkyfile $pageName bothways -var BOTHWAYS
     book getword diffSkyfile $pageName workdir -var WORKDIR_TEMPLATE
     book getword diffSkyfile $pageName dbname -var DBNAME
@@ -164,4 +165,7 @@
 
     $run = diff_skycell.pl --threads @MAX_THREADS@ --diff_id $DIFF_ID --skycell_id $SKYCELL_ID --diff_skyfile_id $DIFF_SKYFILE_ID --outroot $outroot --redirect-output
+    if ($BOTHWAYS > 1)
+       $run = $run --inverse
+    end
     add_standard_args run