How to Add a Warning when Navigating to an External Website?

Hello everyone,
I am working on a website for a client. I am editing their current site that was build by someone else so I am still "learning the code".

Basically, my client wants it so that when a user clicks on a link on the site that takes them AWAY from the company's site, it displays a warning message notifying the user that they are leaving the site.

I know this is extremely annoying, but thats what my client wants. Does anyone know how I can add something like this so it happens "automatically", meaning, I don't have to create a special page for every external link.

Is there a way for some type of PHP script of something to detect when a user clicks a link to an external site it displays the message?

Thanks!
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mfranzelAsked:
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basicinstinctCommented:
you could do this in javascript...

attach a click event handler on the body element of each html page

each click check if the event target is an anchor (you will actually need to check if it's inside an anchor too)

if it is an anchor then check the href - if the href is on a different domain to the current page (window.location.host) then show your message and cancel the event or let it thru as necessary
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ZylochCommented:
Observe that you will need JavaScript in order to display the confirmation message, so you may as well do the entire thing in JavaScript.

For example,
window.onload = function()
{
    for (var i = 0; i < document.links.length; i++)
    {
        var lnk = document.links[i];
        if (lnk.href.indexOf(window.location.hostname) === -1)
        {
            lnk.onclick = function()
            {
                return confirm("Are you sure you want to leave?");
            };
        }
    }
};

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basicinstinctCommented:
i made a start for you... runs in chrome on linux that's all i checked...

http://jsfiddle.net/6NXyD/5/

(function(){
    var container = document.getElementById("container");
    if(container.addEventListener)
    {
        container.addEventListener("click", clickEvent, false);
    }
    else
    {
        container.attachEvent("onclick", clickEvent);
    }
    
    function clickEvent($event)
    {
        $event = $event || self.event;
        var element = $event.target || $event.srcElement;
        
        while(element)
        {
            if(/^a$/i.test(element.tagName))
            {
                if(element.href.indexOf(window.location.origin) !== 0)
                {
                    if(!confirm("really want to go away?"))
                    {
                        if($event.preventDefault)
                        {
                            $event.preventDefault();
                        }
                        else
                        {
                            $event.returnValue = false;
                        }
                    }
                };
                break;
            }
            element = element.parentNode;
        }
    }
})();
¿

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