Returning list box values from pop up window to parent in asp.net

[Priyasal]

Hi all,

I need to get the list box selected values from pop up window to the parent asp page which too contains list box.Iam using code -behind script.The pop up window is retuning value to textbox in parent page,but i need the same for list box .
Can any one help me,

This is my code line

Page.ClientScri pt.RegisterStar tupScript(Page. GetType(), "openpopup" , "<script language=javasc ript>window.ope ner.document.ge tElementById('T extBox1').value ='" + selectedtext + "';</script>")

Thanks in advance

[MacNuttin]

I found this example:
http://www.simply-postcode-lookup.com/Software/ProgrammingASPP opup.htm

I'm trying to do the same thing