void Button2_action();
void Button1_action();

/* string to action bindings */
XtActionsRec   actions[] =    {
     {"button2_action",          (XtActionProc) Button2_action},
     {"button1_action",          (XtActionProc) Button1_action},
};

void Button2_action (w, event, params, num_params)
Widget    w;
XEvent    event;
String    params;
Cardinal  num_params;
{
	fprintf(stdout,"Using the middle mouse button\n");
}
void Button1_action (w, event, params, num_params)
Widget    w;
XEvent    event;
String    params;
Cardinal  num_params;
{
	fprintf(stdout,"Using the left mouse button\n");
}

XtAppAddActions(app_con, actions, XtNumber(actions));