Pashok,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function ()
{
$('.wa-field').each(function()
{
$('input', this).attr("placeholder", $('.wa-name', this).html())
}
);
}
)
</script>
</head>
<body>
<form action="" method="post" class="mpf">
<div class="wa-form">
<div class="wa-field wa-field-firstname wa-required">
<div class="wa-name">Имя</div>
<div class="wa-value"><input type="text" name="customer[firstname]" value=""></div>
</div>
<div class="wa-field wa-field-lastname wa-required">
<div class="wa-name">Фамилия</div>
<div class="wa-value"><input type="text" name="customer[lastname]" value=""></div>
</div>
<div class="wa-field wa-field-phone wa-required">
<div class="wa-name">Телефон</div>
<div class="wa-value"><p><input type="text" name="customer[phone]" value=""></p></div>
</div>
<div class="wa-field wa-field-email wa-required">
<div class="wa-name">Email</div>
<div class="wa-value"><p><input type="text" name="customer[email]" value=""></p></div>
</div>
<div class="wa-field wa-field-company wa-required">
<div class="wa-name">Официальное название организации</div>
<div class="wa-value"><input type="text" name="customer[company]" value=""></div>
</div>
</div>
</form>
</body>
</html>