dojo.require('dojo.data.ItemFileWriteStore');
dojo.addOnLoad(function(){
    dojo.declare('SimpleSaveWriteStore', dojo.data.ItemFileWriteStore, {
        _postUrl: 'postdata.php',

        _saveEverything: function(saveCompleteCallback, saveFailedCallback, newFileContentString) {
            dojo.xhrPost({
                    url: this._postUrl,
                    content: {
                    data: newFileContentString
                },
                load: saveCompleteCallback,
                error: saveFailedCallback
            });
        }
    });
});