If Yes display text box

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Untitled Page</title>
<script language="javascript">
function chkFrm()
{
if (document.getElementById("Select1").value == "Yes")
{
document.getElementById("hiddenBox").style.visibility = "visible";
}
else
{
document.getElementById("hiddenBox").style.visibility = "hidden";
}
if (document.getElementById("Select2").value == "Yes")
{
document.getElementById("hiddenBox2").style.visibility = "visible";
}
else
{
document.getElementById("hiddenBox2").style.visibility = "hidden";
}
}
</script>
</head>
<body>
<form method="post" action="#" name="form1">
Do you like pasta ?
<select id="Select1" onchange="chkFrm()">
<option value="No">No</option>
<option value="Yes">Yes</option>
</select>
<div id="hiddenBox" style="visibility:hidden">
Do you prefer it with or without sauce?  <input id="Text1" type="text" />
</div>
<br /><br />
Are you married ?
<select id="Select2" onchange="chkFrm()">
<option value="No">No</option>
<option value="Yes">Yes</option>
</select>
<div id="hiddenBox2" style="visibility:hidden">
Spouse name?  <input id="Text1" type="text" />
</div>
</form>
</body>
</html>