JQuery window.opener

$('#Save').click(function () {
    var parent = $(parent.document.body);
    $(parent).find('input#addr_address1').val(addone);
    $(parent).find('input#addr_address2').val(addtwo);
    $(parent).find('input#addr_city').val(city);
    $(parent).find('input#addr_county').val(county);
    $(parent).find('input#addr_postcode').val(postcode);
    $(parent).find('input#addr_country').val(country);
    window.close();           
});

var parent=$(window.top.document);

var parent=$(window.opener.document);

var parent=$(window.top.frames[0].document);