// set the document domain to the parent domain

function setDomain() {
    try {

        var patt = /(\w+)(.\w+)?$/;
        var parentDomain = patt.exec(document.domain)[0];
        document.domain = parentDomain;
    }
    catch (e) { }
}

if (window.addEventListener) {
    window.addEventListener('load', setDomain, false);
}
else
    window.onload = setDomain;