var rawPuid = getParam("puid");
var rawPid = getParam("pid");

var hashedPush = readCookie("_push");
var hashedXguid = readCookie("_xguid");
var push = decodeURIComponent(hashedPush);
var i = push.indexOf(":");
if (i > -1) {
    var checksum = push.substr(i+1, push.length);
    var jschecksum = crc32(rawPid + "." + rawPuid + "." + hashedXguid);
    if (parseInt(checksum) != jschecksum){
    // push cookie is not validated, expire the push cookie.
        Delete_Cookie("_push", "/", ".xgraph.net");
        Delete_Cookie("_push4xgat", "/", ".xgraph.net");
    }
}