diff -Nur -x '*.orig' -x '*~' pxljr-1.1/i_job_header.c pxljr-1.1.new/i_job_header.c
--- pxljr-1.1/i_job_header.c	2006-12-31 21:26:41.000000000 +0100
+++ pxljr-1.1.new/i_job_header.c	2008-09-23 22:35:57.000000000 +0200
@@ -67,7 +67,16 @@
     }
 
   ts += sprintf(ts, "@PJL SET COPIES=1\x00a");
-  ts += sprintf(ts, "@PJL SET DUPLEX=OFF\x00d\x00a"); /* this is broken in HPIJS */
+  if (job_info->duplex) {
+    ts += sprintf(ts, "@PJL SET DUPLEX=ON\x00d\x00a");
+    if (job_info->tumble) {
+      ts += sprintf(ts, "@PJL SET BINDING=SHORTEDGE\x00d\x00a");
+    } else {
+      ts += sprintf(ts, "@PJL SET BINDING=LONGEDGE\x00d\x00a");
+    }
+  } else {
+    ts += sprintf(ts, "@PJL SET DUPLEX=OFF\x00d\x00a");
+  }
   ts += sprintf(ts, "@PJL SET RESOLUTION=600\x00a");
   ts += sprintf(ts, "@PJL SET TIMEOUT=90\x00a");
   ts += sprintf(ts, "@PJL ENTER LANGUAGE=PCLXL\x00a");
diff -Nur -x '*.orig' -x '*~' pxljr-1.1/i_job_info.h pxljr-1.1.new/i_job_info.h
--- pxljr-1.1/i_job_info.h	2006-12-31 21:31:33.000000000 +0100
+++ pxljr-1.1.new/i_job_info.h	2008-09-23 22:35:57.000000000 +0200
@@ -50,6 +50,8 @@
   int pixel_v;
   int papertype;
   int copies;
+  int duplex;
+  int tumble;
   struct jpeg_compress_struct *cinfo;
   struct jpeg_error_mgr *jerr;
   unsigned char *compressedbuffer;
diff -Nur -x '*.orig' -x '*~' pxljr-1.1/i_main.c pxljr-1.1.new/i_main.c
--- pxljr-1.1/i_main.c	2006-12-31 21:25:36.000000000 +0100
+++ pxljr-1.1.new/i_main.c	2008-09-23 22:35:57.000000000 +0200
@@ -87,7 +87,7 @@
 		 char *val_buf,
 		 int val_size)
 {
-  const char *param_list = "OutputFile,OutputFD,DeviceManufacturer,DeviceModel,PageImageFormat,Dpi,Width,Height,BitsPerSample,ByteSex,ColorSpace,NumChan,PaperSize,PrintableArea,PrintableTopLeft,TopLeft,Quality,Quality:Quality,PaperType,Copies";
+  const char *param_list = "OutputFile,OutputFD,DeviceManufacturer,DeviceModel,PageImageFormat,Dpi,Width,Height,BitsPerSample,ByteSex,ColorSpace,NumChan,PaperSize,PrintableArea,PrintableTopLeft,TopLeft,PS:Duplex,PS:Tumble,Quality,Quality:Quality,PaperType,Copies";
   int size = strlen (param_list);
 
   if (size > val_size)
@@ -116,6 +116,10 @@
     val = "hp color LaserJet 3500,hp color LaserJet 3550";
   else if (!strcmp (key, "PageImageFormat"))
     val = "Raster";
+  else if (!strcmp (key, "PS:Duplex"))
+    val = "true,false";
+  else if (!strcmp (key, "PS:Tumble"))
+    val = "true,false";
 
   if (val == NULL)
       return IJS_EUNKPARAM;
@@ -294,6 +298,10 @@
     val = "Raster";
   else if (!strcmp (key, "Dpi"))
     val = "600x600";
+  else if (!strcmp (key, "PS:Duplex"))
+    val = "false";
+  else if (!strcmp (key, "PS:Tumble"))
+    val = "false";
 
   if (val == NULL)
       return IJS_EUNKPARAM;
@@ -539,7 +547,43 @@
 	}
     }
 
-  /* Copies */
+  /* Duplex */
+  s = find_param(pl, "PS:Duplex");
+  if (s == NULL)
+    {
+      fprintf(stderr, "Duplex not set, using default Off (0)\n");
+      job_info->duplex = 0;
+    }
+  else 
+    if (strncmp(s, "true", 4) == 0)
+      job_info->duplex = 1;
+    else if (strncmp(s, "false", 5) == 0)
+      job_info->duplex = 0;
+    else
+      {
+        fprintf(stderr, "Unknown Duplex value %s, aborting!\n", s);
+        return 1;
+      }
+
+  /* Tumble */
+  s = find_param(pl, "PS:Tumble");
+  if (s == NULL)
+    {
+      fprintf(stderr, "Tumble not set, using default Off (0)\n");
+      job_info->tumble = 0;
+    }
+  else 
+    if (strncmp(s, "true", 4) == 0)
+      job_info->tumble = 1;
+    else if (strncmp(s, "false", 5) == 0)
+      job_info->tumble = 0;
+    else
+      {
+        fprintf(stderr, "Unknown Tumble value %s, aborting!\n", s);
+        return 1;
+      }
+
+  /* Quality */
   s = find_param(pl, "Quality:Quality");
   if (s == NULL)
     {