Save cookies with javascript how to specify domain?

I'm using this code to save cookies: function saveCookie(name,value) { var date = new Date(); date.setTime(date.getTime()+(60*24*60*60*1000)); var expires = "; expires="+date.toGMTString(); document.cookie = name+"="+value+expires+"; path=/"; } My problem is that it saves the cookie with domain "" and I want to write them to "" so I can also read them from subdomains. This is easy to do with PHP but I don't know how to do it with javascript. How can I add a dot before the domain when I save the cookie?

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