Even easier...
Code:
<!DOCTYPE HTML>
<html>
<head>
<title> Untitled </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

</head>
<body>
<div style="float:right">
<select id="menu1" onchange="Msg(this.value)">
 <option value="0"> In-game Minute </option>
 <option value="1"> Minute 15 </option>
 <option value="2"> Minute 25 </option>
 <option value="3"> Minute 35 </option>
 <option value="4"> Minute 45 </option>
</select>

<select id="menu2" onchange="Msg(this.value)">
 <option value="5"> Chambion Level </option>
 <option value="6"> Level 14 </option>
 <option value="7"> Level 15 </option>
 <option value="8"> Level 16 </option>
 <option value="9"> Level 17 </option>
 <option value="10"> Level 18 </option>
</select>
</div>
<p style="clear:both">

<div id="ActionBlock"></div>

<script type="text/javascript">
var Messages = [
 'In-Game Minute',
   'Minute 15',  'Minute 25',  'Minute 35',  'Minute 45',
 'Champion Level',
   'Level 14',  'Level 15',  'Level 16',  'Level 17',  'Level 18'
];

var ActionVariable = 0;
function Msg(N) {
  ActionVariable = N;
//  alert(Messages[N]);  // Do something here based upon message clicked (???)
  document.getElementById('ActionBlock').innerHTML = Messages[N];
}
</script>

</body>
</html>