how to pass selected item from listbox of one form to text box of other form in javascript and html

i call given given below function setpara() in onchange event of listbox control


function setpara()
{
//alert('Hey I said not to try clicking this link');

document.form11.t1.Value=document.f1.cns_1.getSelectedValue;
document.form11.t2.Value=document.f1.cns_2.getSelectedValue;


}

here t1 and t2 are textbox names

and cns_1 and cns_2 are listbox names

and f1 and form11 are form names



but stilll this code is not work
what to do...now