diff --git a/html/includes/graphs/generic_bits.inc.php b/html/includes/graphs/generic_bits.inc.php
index b16cf840a..c3314b2d4 100644
--- a/html/includes/graphs/generic_bits.inc.php
+++ b/html/includes/graphs/generic_bits.inc.php
@@ -1,7 +1,7 @@
 <?php
 
 /// Draw generic bits graph
-/// args: ds_in, ds_out, rrd_filename, bg, legend, from, to, width, height, inverse
+/// args: ds_in, ds_out, rrd_filename, bg, legend, from, to, width, height, inverse, previous
 
 include("includes/graphs/common.inc.php");
 
@@ -26,6 +26,39 @@ if ($multiplier)
   $rrd_options .= " DEF:".$in."octets_max=".$rrd_filename_in.":".$ds_in.":MAX";
 }
 
+if($_GET['previous'] == "yes")
+{
+  if ($multiplier)
+  {
+    $rrd_options .= " DEF:p".$out."octetsX=".$rrd_filename_out.":".$ds_out.":AVERAGE:start=".$prev_from.":end=".$from;
+    $rrd_options .= " DEF:p".$in."octetsX=".$rrd_filename_in.":".$ds_in.":AVERAGE:start=".$prev_from.":end=".$from;
+    $rrd_options .= " SHIFT:p".$out."octetsX:$period";
+    $rrd_options .= " SHIFT:p".$in."octetsX:$period";
+    $rrd_options .= " CDEF:inoctetsX=pinoctetsX,$multiplier,*";
+    $rrd_options .= " CDEF:outoctetsX=poutoctetsX,$multiplier,*";
+  } else {
+    $rrd_options .= " DEF:".$out."octetsX=".$rrd_filename_out.":".$ds_out.":AVERAGE:start=".$prev_from.":end=".$from;
+    $rrd_options .= " DEF:".$in."octetsX=".$rrd_filename_in.":".$ds_in.":AVERAGE:start=".$prev_from.":end=".$from;
+    $rrd_options .= " SHIFT:".$out."octetsX:$period";
+    $rrd_options .= " SHIFT:".$in."octetsX:$period";
+  }
+
+  $rrd_options .= " CDEF:octetsX=inoctetsX,outoctetsX,+";
+  $rrd_options .= " CDEF:doutoctetsX=outoctetsX,-1,*";
+  $rrd_options .= " CDEF:outbitsX=outoctetsX,8,*";
+  #$rrd_options .= " CDEF:outbits_maxX=outoctets_maxX,8,*";
+  #$rrd_options .= " CDEF:doutoctets_maxX=outoctets_maxX,-1,*";
+  $rrd_options .= " CDEF:doutbitsX=doutoctetsX,8,*";
+  #$rrd_options .= " CDEF:doutbits_maxX=doutoctets_maxX,8,*";
+
+  $rrd_options .= " CDEF:inbitsX=inoctetsX,8,*";
+  #$rrd_options .= " CDEF:inbits_maxX=inoctets_maxX,8,*";
+  $rrd_options .= " VDEF:totinX=inoctetsX,TOTAL";
+  $rrd_options .= " VDEF:totoutX=outoctetsX,TOTAL";
+  $rrd_options .= " VDEF:totX=octetsX,TOTAL";
+
+}
+
 $rrd_options .= " CDEF:octets=inoctets,outoctets,+";
 $rrd_options .= " CDEF:doutoctets=outoctets,-1,*";
 $rrd_options .= " CDEF:outbits=outoctets,8,*";
@@ -79,4 +112,10 @@ $rrd_options .= " GPRINT:totout:'Out %6.2lf%s)\\\\l'";
 $rrd_options .= " LINE1:95thin#aa0000";
 $rrd_options .= " LINE1:d95thout#aa0000";
 
+if($_GET['previous'] == "yes")
+{
+  $rrd_options .= " LINE1.25:inbitsX#009900:'Prev In \\\\n'";
+  $rrd_options .= " LINE1.25:doutbitsX#000099:'Prev Out'";
+}
+
 ?>
diff --git a/html/includes/graphs/graph.inc.php b/html/includes/graphs/graph.inc.php
index f832e9d52..d5c4cdd90 100644
--- a/html/includes/graphs/graph.inc.php
+++ b/html/includes/graphs/graph.inc.php
@@ -19,6 +19,10 @@ $to       = (isset($_GET['to']) ? $_GET['to'] : time());
 
 if ($from < 0) { $from = $to + $from; }
 
+$period = $to - $from;
+
+$prev_from = $from - $period;
+
 $graphfile = $config['temp_dir'] . "/"  . strgen() . ".png";
 
 preg_match('/^(?P<type>[A-Za-z0-9]+)_(?P<subtype>.+)/', $_GET['type'], $graphtype);