diff -Naur xpdf-3.01/xpdf/XPDFViewer.cc xpdf-3.01-centred/xpdf/XPDFViewer.cc
--- xpdf-3.01/xpdf/XPDFViewer.cc	2005-08-17 06:34:31.000000000 +0100
+++ xpdf-3.01-centred/xpdf/XPDFViewer.cc	2006-08-24 10:04:07.000000000 +0100
@@ -342,11 +342,11 @@
       break;
     case 'N':
     case 'n':
-      viewer->core->gotoNextPage(1, !(modifiers & Mod5Mask));
+      viewer->core->gotoNextPage(1, (modifiers & Mod5Mask));
       break;
     case 'P':
     case 'p':
-      viewer->core->gotoPrevPage(1, !(modifiers & Mod5Mask), gFalse);
+      viewer->core->gotoPrevPage(1, (modifiers & Mod5Mask), gFalse);
       break;
     case ' ':
       if (viewer->app->getFullScreen()) {