Payment schedule script:

Source:

<?php
if ($select==m1) {
$periodicity="12";
}
if ($select==m3) {
$periodicity="4";
}
if ($select==y1) {
$periodicity="1";
}
if ($select==m6) {
$periodicity="2";
}
?>
<form action="<?=$PHP_SELF?>" method="POST">
recurring&nbsp;&nbsp;<select name="select" size="1">
<option value="m1" selected="selected">Monthly</option>
<option value="m3">Quarterly</option>
<option value="y1">Annually</option>
<option value="m6">Semi-Annually</option>
</select>
<p>#installments <?php echo "$periodicity"; ?></p>
<input type="submit" value="Submit" name="Submit">
&lt;- Try it.
</form>