startDebugger = function () {
    
    var runnable = {
        run: function () {
            main.dispose();
        }
    }
    
    
    var context = Packages.org.mozilla.javascript.Context.getCurrentContext();
    // Within the current context...
    var contextFactory = context.getFactory();
    var scope = Packages.org.mozilla.javascript.tools.shell.Environment(runnable.__parent__);
    // and the scope of the runnable variable's parent ...
    var main = Packages.org.mozilla.javascript.tools. debugger.Main.mainEmbedded(contextFactory, scope, 'Debugger');
    // start a debugging session ...
    main.setExitAction(java.lang.Runnable(runnable));
    // , clean the resources at exit time...
    main.setVisible(true);
    // and make it visible/
}