Setting cookie on first visit

[Tom Whitbread <tom@xxxxxxxxxxxxxxxx>]

I am using a cookie to detect what skin a user wants to display. The 
problem is if a user visits the site for the first time the cookie is 
not being set. I am detecting if its being set or not with

if(!isset($_COOKIE['skin'])){ ... }

It's not setting the cookie untill a user refreshes the page once. How 
can I ensure it's set when it hasnt been set before?

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