Look for cookie of external site then redirect

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I have a ning network. i have also got a custom homepage which is just a html/css site. What I need is a script to detect if they have previously visited my ning site and are logged in. If not they don't get redirected. Any thoughts would be great. Thanks

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MassivePenguin On

You can't read cookies from a different domain (i.e. a page at stackoverflow.com can't read cookies set by microsoft.com) - it's a pretty obvious security feature. See this article on quirksmode for more info. If you're using a different domain for your homepage than your ning site, then you're out of luck.