Index: trunk/ippScripts/scripts/stack_skycell.pl
===================================================================
--- trunk/ippScripts/scripts/stack_skycell.pl	(revision 12115)
+++ trunk/ippScripts/scripts/stack_skycell.pl	(revision 12218)
@@ -112,6 +112,9 @@
 }
 
+$workdir = File::Spec->catfile( $workdir, "sky$skycell_id" );
+system "mkdir -p $workdir" unless -d $workdir;
+
 # Get the output filenames
-my $outputFile = "$skycell_id.stack.$stack_id"; # Root name
+my $outputFile = "sky$skycell_id.stk$stack_id"; # Root name
 my $outputRoot = File::Spec->catfile( $workdir, $outputFile );