HTML code generator

<html>
<body>
<form name="form1" method="get">
    Gamemode: <br>
<select id="gamemode">
    <option>Casual</option>
    <option>Deathmatch</option>
    <option>Arms Race</option>
    <option>Demolition</option>
    <option>Competitive</option>
</select>
<br><br>
Map: <br>
<select>
    <option>Dust 2</option>
    <option>Nuke</option>
    <option>Mirage</option>
    <option>Inferno</option>
    <option>Cobblestone</option>
    <option>Overpass</option>
    <option>Cache</option>
    <option>Train</option>
    <option>Aztec</option>
    <option>Dust</option>
    <option>Vertigo</option>
    <option>Office</option>
    <option>Italy</option>
    <option>Assault</option>
    <option>Militia</option>
    <option>Workout</option>
    <option>Back Alley</option>
    <option>Marquis</option>
    <option>Facade</option>
    <option>Season</option>
    <option>Bazaar</option>
</select>
<br><br>

    <input type="submit" value="Generate" name="generate" id="button" onClick="function result(){alert(document.getElementsByName('form1'))};result();">
</form>
</body>
</html>