It took two files, but I finally got it!
<html>
<head>
</head>
<body>
<?php
$Total;
$Price = $POST["Price"];
$Qty = $POST["Qty"];
$Tax = $_POST["Tax"];
$TaxAmount;
$GrandTotal;
$SubTotal;
$HiddenTotal = $_POST["HiddenTotal"];
if($Price > 0 && $Qty > 0)
{
$SubTotal = $Price * $Qty;
$TaxAmount = $SubTotal * ($Tax / 100);
$Total = $SubTotal + $TaxAmount;
$GrandTotal = $Total + $HiddenTotal;
}
?>
<form action ="Project_04_Cash_Register.php" method ="POST" name =
"CashRegister">
<table border = 0>
<tr>
<td>Item Price: $</td>
<td><input type = "text" name = "Price" maxlength = 20></td>
<td>x</td>
<td><input type = "text" name = "Qty" align = "left" maxlength = 20></td>
</tr>
<tr>
<td>Sales Tax: </td>
<td><input = "text" name = "Tax"></td>
<td>%</td>
</tr>
<tr>
<td>Total: $ </td>
<td><input type = "text" STYLE = "border = 0; background-color: #D3D3D3;" name = "Total" size = 30 readonly value = "<?php echo $GrandTotal?>"></td>
<input type = "hidden" name = "HiddenTotal" value = "<?php echo $GrandTotal?>">
</tr>
<tr>
<td></td>
<td><input type = "submit" name = "Get Total" value = "Get Total">
<form action = "Clear.php" method = "POST" name = "ClearCashRegister">
<input type = "submit" name = "Clear" value = "Clear" align = "left"></form></td>
</tr>
</table>
</form>
</body>
</html>
This is the php file for the clear button to post to...
<html>
<head>
</head>
<body>
<?php
$GrandTotal = 0;
$HiddenTotal = 0;
$_POST["Total"] = "";
?>
</body>
</html>
Thanks to all for your help.
