What's the best way to replace links with JS functions?

Question

A pattern that\'s started to show up a lot in one of the web apps I\'m working are links that used to just be a regular a-tag link now need a popup box asking \"are you sure?\"

Answer 1

var links = document.getElementsByTagName('A');

for (var i = 0; i < links.length; i++)
{ 
    links[i].onclick = function ()
    {       
       return Confirm("Are you sure?");
    }
}

This applies the message to all links, however its a little harder to make the links not work without javascript automatically (actually its impossible).