Populating values from Child Popup Jsp to Parent jsp

i have provided example using the text fields use it as reference this function in the parent file

function pop(col) { 
    var f=document.form;
    f.method="post";
    var pn=document.getElementById("parent_field_id").value;
    var W1 = window.open("ChildFileName.jsp?colname="+pn,'PopFrameless','height=310,width=310,scrollbars=yes,titlebar=no,toolbar=no,menubar=no,resizable=no,status=no'); 
    W1.moveTo(450,400);

}

this function in the childFileName file

function showSelected(){

var i=document.getElementById("child_field_id").value;
opener.document.form.parent_name_id.value = i;
opener.document.form.submit();
window.close();

}

i think this mapping is usefull to you.

sorry for mis spelt in the

showSelected(){
opener.document.form.parentfieldid.value=i;
}