Posting php variables into an html form

[Lassie]

Can anybody give me a starter for 10 on this.
I need to integrate a paypal form with hidden values into my shopping cart.
The form needs an aggregate value named 'amount'
This value is held in a session variable on my checkout page $SESSION ['total_price']
How do I transfer the value of total price to the form field?
the form code is

<form action="https://www.paypal.com/uk/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="xxxx.com">
<input type="hidden" name="item_name" value="xxxxx">
<input type="hidden" name="currency_code" value="GBP">
<nput type="hidden" name="amount" value="0.00">
<input type="image" src="http://www.paypal.com/en_GB/i/btn/x-click-but01.gif" name="submit" alt="Make payments with PayPal - it's fast, free and secure!">
</form>

[kenrbnsn]

You need to put the value into this line:
[code]
<input type="hidden" name="amount" value="<?php echo $_SESSION['total_price'] ?>">

[/code]

Ken

[Lassie]

Thanks Ken, much appreciated.