Fix minor syntax errors.

tbsetup/batchexp.in

 #!/usr/bin/perl -wT
 #
 # EMULAB-COPYRIGHT
-# Copyright (c) 2000-2005 University of Utah and the Flux Group.
+# Copyright (c) 2000-2006 University of Utah and the Flux Group.
 # All rights reserved.
 #
 use English;
@@ -1059,7 +1059,7 @@ sub GetNSFile()
 	my $copyeid = $2;
 	my $copytag = $3;
 
-	if ($copytag == "") {
+	if ($copytag eq "") {
 	    GetNSFileFromExperiment($copypid, $copyeid);
 	}
 	else {
@@ -1078,7 +1078,7 @@ sub GetNSFile()
 	# archive instead of what is currently in the filesystem. 
 	#
 	my $exptidx = $1;
-	my $copytag = ($2 == "" ? undef : $2);
+	my $copytag = ($2 eq "" ? undef : $2);
 
 	my $query_result =
 	    DBQueryFatal("select pid,eid from experiment_stats ".