diff --git a/Examples/javascript/variables/Makefile b/Examples/javascript/variables/Makefile
index ea41e55..e80e370 100755
--- a/Examples/javascript/variables/Makefile
+++ b/Examples/javascript/variables/Makefile
@@ -1,6 +1,6 @@
 TOP = ../..
 SWIG = $(TOP)/../preinst-swig
-SRCS = example.cpp
+SRCS = example.c
 JSCXXSRCS = $(TOP)/../Tools/javascript/javascript.cxx
 JAVASCRIPT_EXE = $(TOP)/../Tools/javascript/javascript
 JAVASCRIPT_MODULE = example
@@ -11,7 +11,7 @@ SWIGOPT = -I$(TOP)/../Lib/javascript -I$(TOP)/../Lib/javascript/jsc
 
 all::
 	$(MAKE) -f $(TOP)/Makefile SRCS='$(SRCS)' SWIG='$(SWIG)' \
-SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' javascript_cpp
+SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' javascript
 
 clean::
 	$(MAKE) -f $(TOP)/Makefile javascript_clean
diff --git a/Examples/javascript/variables/example.cpp b/Examples/javascript/variables/example.c
similarity index 100%
rename from Examples/javascript/variables/example.cpp
rename to Examples/javascript/variables/example.c
diff --git a/Examples/javascript/variables/runme.js b/Examples/javascript/variables/runme.js
index bfefd7f..7c4e151 100755
--- a/Examples/javascript/variables/runme.js
+++ b/Examples/javascript/variables/runme.js
@@ -1,7 +1,5 @@
-
 // file: runme.js
 
-
 // Try to set the values of some global variables
 example.ivar   =  42;
 example.svar   = -31000;
@@ -36,8 +34,8 @@ print("strvar    = " + example.strvar+ "\n");
 print("cstrvar   = " + example.cstrvar+ "\n");
 print("iptrvar   = " + example.iptrvar+ "\n");
 print("name      = " + example.name + "\n");
-print("ptptr     = " + example.ptptr + example.Point_print(ptptr) + "\n");
-print("pt        = " + pt + "," + Point_print(pt) + "\n");
+print("ptptr     = " + example.ptptr + ": " + example.Point_print(example.ptptr) + "\n");
+print("pt        = " + example.pt + ": " + example.Point_print(example.pt) + "\n");
 
 
 print("\nVariables (values printed from C)");
@@ -53,17 +51,18 @@ try{
 }
 catch(e){
     print("Good.");
+}
 
 print("Trying to set 'status'");
 try{
     example.status = 0;
     print("Hey, what's going on?!?! This shouldn't work");
-  }
-catch(e){
+} catch(e){
     print("Good.");
 }
+
 print("\nI'm going to try and update a structure variable.\n");
 example.pt = example.ptptr;
-print("The new value is");
+print("The new value is: ");
 example.pt_print();
-print("You should see the value" + example.Point_print(example.ptptr));
+print("You should see the value: " + example.Point_print(example.ptptr));
diff --git a/Lib/javascript/jsc/javascripthelpers.swg b/Lib/javascript/jsc/javascripthelpers.swg
index 0c18cc6..86d6323 100644
--- a/Lib/javascript/jsc/javascripthelpers.swg
+++ b/Lib/javascript/jsc/javascripthelpers.swg
@@ -1,4 +1,4 @@
-%insert(runtime) %{
+%insert(wrapper) %{
  
 bool JS_registerClass(JSGlobalContextRef context, JSObjectRef parentObject,
                              const char* className,
@@ -38,4 +38,22 @@ bool JS_registerFunction(JSGlobalContextRef context, JSObjectRef object,
     JSStringRelease(js_functionName);
     return true;
 }
+
+bool JS_veto_set_variable(JSContextRef context, JSObjectRef thisObject, JSStringRef propertyName, JSValueRef value, JSValueRef* exception)
+{
+    char buffer[256];
+    char msg[512];
+    int res;
+    
+    JSStringGetUTF8CString(propertyName, buffer, 256);
+    res = sprintf(msg, "Tried to write read-only variable: %s.", buffer);
+    
+    if(res<0) {
+      SWIG_exception_fail(SWIG_ERROR, "Tried to write read-only variable.");
+    } else {
+      SWIG_exception_fail(SWIG_ERROR, msg);
+    }
+    
+    return false;
+}
 %}
diff --git a/Source/Modules/javascript.cxx b/Source/Modules/javascript.cxx
index 289c554..1dbd8f4 100644
--- a/Source/Modules/javascript.cxx
+++ b/Source/Modules/javascript.cxx
@@ -244,6 +244,7 @@ class JSCEmitter:public JSEmitter {
     File *f_init;
 
     String *NULL_STR;
+    String *VETO_SET;
     const char *GLOBAL_STR;
 
     // contains context specific structs
@@ -538,11 +539,12 @@ Template & Template::replace(const String *pattern, const String *repl) {
 }
 
 JSCEmitter::JSCEmitter()
-:  JSEmitter(), NULL_STR(NewString("NULL")) {
+:  JSEmitter(), NULL_STR(NewString("NULL")), VETO_SET(NewString("JS_veto_set_variable")) {
 }
 
 JSCEmitter::~JSCEmitter() {
   Delete(NULL_STR);
+  Delete(VETO_SET);
 }
 
 /* ---------------------------------------------------------------------
@@ -810,7 +812,7 @@ int JSCEmitter::exitFunction(Node *n) {
 
 int JSCEmitter::enterVariable(Node *n) {
   current_getter = NULL_STR;
-  current_setter = NULL_STR;
+  current_setter = VETO_SET;
   current_propertyname = Swig_scopename_last(Getattr(n, "name"));
   is_immutable = GetFlag(n, "wrap:immutable");
 
@@ -824,7 +826,6 @@ int JSCEmitter::exitVariable(Node *n) {
       .replace("${getname}", current_getter)
       .replace("${propertyname}", current_propertyname);
 
-
   if (GetFlag(n, "ismember")) {
     if (Equal(Getattr(n, "storage"), "static") || (Equal(Getattr(n, "nodeType"), "enumitem"))) {