$.ajaxProgress = function () {
    var imageSrc = 'progress06.gif';
}
$.ajaxProgress.setImage = function (src) {
    this.imageSrc = src;
};
$.ajaxProgress.getImage = function () {
    return this.imageSrc;
};
$.fn.ajaxProgress = function () {
    this.empty();
    ($('<span><img src="'+$.ajaxProgress.getImage()+'" alt="loading..." /></span>')).appendTo(this);
    return this;
}