Creating a JavaScript cookie on a domain and reading it across sub domains

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Just set the domain and path attributes on your cookie, like:

<script type="text/javascript">
var cookieName="HelloWorld";
var cookieValue="HelloWorld";
var myDate = new Date();
myDate.setMonth(myDate.getMonth() + 12);
document.cookie = cookieName +"=" + cookieValue + ";expires=" + myDate 
                  + ";domain=.example.com;path=/";
</script>

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