How to get the last waterfall view?--Chinese engineer for help!!

I have a page which need to simulate user login before,so I write a script as below:

[php]
setDns g.tbcdn.cn 10.235.136.37navigate http://login.daily.taobao.net/member/login.jhtml?style=miniall&css_style=c_2.0/pc&full_redirect=true&from=tmall&tpl_redirect_url=setValue name=TPL_username tmallb302setValue name=TPL_password taobao1234submitForm id=J_StaticForm navigate http://www.daily.tmall.net
[/php]

But the waterfall picture in the result contains three pages’ full waterfall image, how can I get the only page’s waterfall img which I want, in other word, how can I get the last page’s waterfall image?

My English is very poor and sorry for that.

You can use logData 0 to turn off logging and then logData 1 before the step you want to capture the timings for