Guess you must have a reason.
<html>
<head>
</head>
<body>
<div align="center">
<form name="nameTemp">
First Name: <input name="firstName" type="text"><br>
Last Name: <input name="lastName" type="text">
</form>
<form name="mainForm" onsubmit="return singleName(this)">
age: <input name="age" type="text" value="35"><br>
gender: <input name="gender" type="text" value="male"><br>
sex: <input name="sex" type="text" value="yes"><br>
<input name="firstLast" type="hidden">
<input type="submit">
</form>
</div>
<script type="text/javascript">
function singleName(form)
{
if (document.nameTemp.firstName.value == '')
{
alert('Please enter your first name.');
document.nameTemp.firstName.focus();
return false;
}
if (document.nameTemp.lastName.value == '')
{
alert('Please enter your last name.');
document.nameTemp.lastName.focus();
return false;
} else {
form.firstLast.value = document.nameTemp.firstName.value + document.nameTemp.lastName.value;
}
return true;
}
</script>
</body>
</html>
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