olololo

<html>
    <head>
        <meta charset="utf-8">
        <script type="text/javascript">
            function loaded(){
                var lolens = document.getElementById('lol');
                lolens.onmouseover = document.getElementById('lole').innerHTML = 'lolz';
                lolens.onmouseout = document.getElementById('lole').innerHTML = '';
            }
        </script>
    </head>
    <body onload="loaded();">
        <div id="lol">kwadrad</div><br><br>
        <div id="lole">lol</div>
    </body>
</html>