diff --git a/gui/Gui/Scytherthread.py b/gui/Gui/Scytherthread.py
index f976c90..f147353 100644
--- a/gui/Gui/Scytherthread.py
+++ b/gui/Gui/Scytherthread.py
@@ -9,6 +9,11 @@ import sys
 import re
 import threading
 import StringIO
+try:
+    from subprocess import Popen
+    AvailablePopen = True
+except:
+    AvailablePopen = False
 
 #---------------------------------------------------------------------------
 
@@ -194,6 +199,9 @@ class AttackThread(threading.Thread):
 
     def makeImage(self,attack):
         """ create image for this particular attack """
+
+        global AvailablePopen
+
         if Preference.usePIL():
             # If we have the PIL library, we can do postscript! great
             # stuff.
@@ -207,23 +215,25 @@ class AttackThread(threading.Thread):
         # command to write to temporary file
         (fd2,fpname2) = Tempfile.tempcleaned(ext)
         f = os.fdopen(fd2,'w')
+        (fd3,fpname3) = Tempfile.tempcleaned(ext)
+        dotfile = os.fdopen(fd3,'w')
+        self.writeGraph(attack.scytherDot,dotfile)
+        dotfile.flush()
+        dotfile.seek(0)
 
-        cmd = "dot -T%s >%s" % (type,fpname2)
+        cmd = "dot -T%s -o%s %s" % (type,fpname2,fpname3)
 
         # execute command
-        cin,cout = os.popen2(cmd,'b')
-    
-        self.writeGraph(attack.scytherDot,cin)
-        cin.flush()
-        cin.close()
-        cout.close()
-
-        f.flush()
-        f.close()
+        # Start the process
+        if AvailablePopen:
+            p = Popen(cmd, shell=False)
+            sts = p.wait()
+        else:
+            os.system(cmd)
 
         # Print
-        print fpname2
-        raw_input()
+        #print fpname2
+        #raw_input()
 
         # if this is done, store and report
         attack.filetype = type
diff --git a/gui/Scyther/Scyther.py b/gui/Scyther/Scyther.py
index 63a9475..736a0f2 100755
--- a/gui/Scyther/Scyther.py
+++ b/gui/Scyther/Scyther.py
@@ -11,6 +11,12 @@ import os.path
 import sys
 import StringIO
 import tempfile
+try:
+    from subprocess import Popen
+    AvailablePopen = True
+except:
+    AvailablePopen = False
+
 
 #---------------------------------------------------------------------------
 
@@ -192,6 +198,7 @@ class Scyther(object):
             output -- string which is the real output
             errors -- string which captures the errors
         """
+        global AvailablePopen
 
         if self.program == None:
             raise Error.NoBinaryError
@@ -226,7 +233,11 @@ class Scyther(object):
         ##print self.cmd
 
         # Start the process
-        os.system(self.cmd)
+        if AvailablePopen:
+            p = Popen(self.cmd, shell=False)
+            sts = p.wait()
+        else:
+            os.system(self.cmd)
 
         # reseek
         fhe = os.fdopen(fde)