<html>
<head>
<script>
function displayResult()
{
document.getElementById('td1').vAlign="top";
document.getElementById('td2').vAlign="top";
document.getElementById('td3').vAlign="top";
}
</script>
</head>
<body>
<table width="50%" border="1">
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Text</th>
</tr>
<tr>
<td id="td1">Peter</td>
<td id="td2">Griffin</td>
<td id="td3">Hello my name is Peter Griffin. I need a long text for this example. I need a long text for this example.</td>
</tr>
</table>
<br>
<button type="button" onclick="displayResult()">Top-align content</button>
</body>
</html>