could't add trash icon on the desktop

[born]

hey,all.
my notebook's OS is ubuntu 9.10.
I want to add my trash icon on the desktop.
I follow the page's setup,and could't add the trash icon to my desktop
http://www.360doc.com/content/070603/22/224_536798.html

is there someone know how to add the trash icon on the desktop?
thanks anyway.
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