safari 跨域cookie 无法存储

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script><script>var isSafari = (/Safari/.test(navigator.userAgent));var firstTimeSession = 0; function submitSessionForm() {    if (firstTimeSession == 0) {        firstTimeSession = 1;        $("#sessionform").submit();        setTimeout(processApplication(),2000);    }   } if (isSafari) {    $("body").append('<iframe id="sessionframe" name="sessionframe" onload="submitSessionForm()" src="http://www.yourdomain.com/blank.php" style="display:none;"></iframe><form id="sessionform" enctype="application/x-www-form-urlencoded" action="http://www.yourdomain.com/startsession.php" target="sessionframe" action="post"></form>');} else {    processApplication();} function processApplication() {    alert('Session has been set. Now you can start your application!');}</script>