Only one outgoing link every 30 seconds
<p>I'm working on a website now with a lot of external links. All links are going through a PHP file called: out.php</p>

<p>So a normal external link would be something like: out.php?url=http://www.google.com</p>

<p>My question is how to prevent people from clicking multiple links at a time? I want them to click only one link in 30 seconds for example. If they click another link an error should be appear telling them to wait the rest for the seconds, before they can visit another page.</p>

<p>Using cookies is not an option, because they still can disable the cookies. </p>

<p>Thanks in advance for any help!</p>
