[PHP] Multiple Host's with setcookie

[david jarvis]

Hi, I was wondering if there was a way to set a cookie so that it would be accessible 
over multiple hosts, for instance, mail.webpage.com, forums.webpage.com, ect.  I tried 
setting the domain to .webpage.com, but when I read the cookie it says the domain is w 
ww.webpage.com, thus not being accessible by mail.webpage.com. Any thoughts would be 
greatly appreciated.