Variables

Hi,
I am fairley new to javascript so please bear with me. I have an asp
page that opens a popup by clicking a button. This is a database lookup
window, when the user click on an option button, values are brought back to
the original form fields, ie customer, address1. address2 etc using:
window.opener.document.getElementById('street').va lue='<%=trim(rsAddress.Fields.Item("ADDRESS1").Val ue)%>'This works fine, but I also need send a value to a variable in the parentwindow at the same time. I want to store the value for "Customer ID" so Ican then change the address for that customer if I need. I can send valuesto a form field but cannot get a value to a variable. Any help would begrteatly appreciated. Thanks!Darren