Bonjour,
<?xml version="1.0" encoding="iso-8859-1"?>
<!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" xml:lang="fr" lang="fr">
<head>
<title></title>
<style type="text/css">
input
{
text-align:right;
}
</style>
<script type="text/javascript">
function calcul(formulaire)
{
if ((formulaire.val1.value == "") || (formulaire.val2.value == "")) return;
formulaire.total.value = parseFloat(formulaire.val1.value) + parseFloat(formulaire.val2.value);
}
</script>
</head>
<body>
<form name="formulaire" id="formulaire" method="post" action="">
<table border="0" width="75%" align="center">
<tr>
<td>Valeur 1</td>
<td>
<input type="text" name="val1" value="" onkeyup="calcul(this.form)" />
</td>
</tr>
<tr>
<td>Valeur 2</td>
<td>
<input type="text" name="val2" value="" onkeyup="calcul(this.form)" />
</td>
</tr>
<tr>
<td>Total</td>
<td>
<input type="text" name="total" value="" readonly="readonly" />
</td>
</tr>
</table>
</form>
</body>
</html>
@+
PS - Je pense qu'il n'ya pas besoin de commentaires.