在浏览器中使用不同的网址在iframe中显示页面

I apologize because my English is not good. I Have a webpage by asp.net that contain one treeview ,xmldatasource,one xml file that related to xmldatasource and one iframe. When user click on a treenode a webpage will be shown in iframe. Now I want when treenodes clicked , my url (e.g "www.mysite.com/default.aspx") change to ("www.mysite.com/default.aspx?onenode") and if I directly enter this url ("www.mysite.com/default.aspx?onenode") on browser mypage shown and that treenode is selected and page(onenode) is shown on iframe . there a way to solve the my problem there? I am waiting for your help. Thank you for Perpend.I apologize because my English is not good. I H