link in alert boxes javascript

use window.confirm instead of alert

if (window.confirm('If you click "ok" you would be redirected . Cancel will load this website ')) 
{
window.location.href='https://www.google.com/chrome/browser/index.html';
};

You can only display text in the alert function. If you want to put an url, you can do it by using jquery's dialog function. Here are some code examples: http://jqueryui.com/dialog/#default