function showMessageBox() {
	var messageBox = nui.showMessageBox({
		title : "系统提示",
		showCloseButton : false,
		showModal : true,
		allowDrag : false,
		html : "<img src=" + contextPath + "/page/main/image/loadding.gif style='margin-right:8px;vertical-align:middle;'/>正在处理中..."
	});
	return messageBox;
}