asked on

Adding two text fields together to a third total text fields

I have a form that I want to pass an "amount" variable to paypal. My user has two distinct sets of radio buttons that feed two text boxes and I would like to add those two text boxes on the fly to a third text box showing the total before the user passes that value to paypal builtin "amount" variable. I am using paypal toolkit and have not found a way to manipulate these variable after the form is posted to my processing page. I don't want to use javascript but have not found another method in my searches. Here is my code...can you help me to get this to work...Secondarily does anyone know where I can find some documentation for the php toolkit..I am solely dependent on their read me file..this is not my primary question..thx for the help

<html>
 
 
<head>
   
     <script language="JavaScript" type="text/JavaScript">
 
     function add() {
     var total= ((document.test.abc.value*1) + (document.test.abd.value*1));
     document.test.total.value=total;
     }
     </script>
</head>
 
 
 
<body>
<center>
<form name="test">
<input type=radio name=R1 value=40.00 onclick="document.test.abc.value=
 
this.value">40.00<br>
<input type=radio name=R1 value=50.00  onclick="document.test.abc.value=
 
this.value">50.00
 
<br><br>
<br>
<input type=radio name=R2 value=5.00 onclick="document.test.abd.value=
 
this.value">5.00<br>
 
<input type=radio name=R2 value=10.00 onclick="document.test.abd.value=
 
this.value">10.00<br>
 
<input type=radio name=R2 value=15.00 onclick="document.test.abd.value=
 
this.value">15.00<br>
<input type=text name=abc onchange="add();" value ="" >
<input type=text name=abd onchange="add();" value ="">
<input type=text size="5"  name=total  >
<input type="reset" name="reset">
</form>
</center>
</body>
 
</html>

Open in new window