<script>
    $(document).ready( function(){
        var changes_to_be_saved = false;

        $('input,select,textarea').change(function(){ changes_to_be_saved = true });

        window.onbeforeunload = function() {
            if ( !changes_to_be_saved && window['CKEDITOR'] ) {
                for ( var editor in CKEDITOR.instances ) {
                    if ( CKEDITOR.instances[editor].checkDirty() ) changes_to_be_saved = true;
                }
            }
            if (needToConfirm) return "You have unsaved changes that will be lost if you leave...";
        };
    });
</script>