Homepage functions

<ul>
    <button onclick="myFunction()">Seattle</button>
    <button onclick="randomFunction()">Go to Random Link</button>
</ul>

<script>
    function myFunction() {
      document.body.style.backgroundImage = "url(seattle.jpg)";
    }
    function randomFunction(){
        var element = document.getElementsByClassName('link');
        var random = Math.floor(Math.random() * 10);
        window.open(element[random].getAttribute("href"));
    }
    </script>