Paypal button in flash

Hello

Here is the code which directed the user to www.paypal.com after clicking the buy now button in a flash site





[LIST=1]
[*]ppbutton.onRelease=function(){
[*]cmd = "_xclick";
[*]business = "payments@somedomain.net";
[*]item_name = "some item nameg";
[*]item_number = "000001";
[*]no_shipping = "2";
[*]shipping = postage.text.substr(0, -3);
[*]amount = curTotal.text.substr(0, -3);
[*]Return = "http://www.somedomain.net/thankyou.html";
[*]cancel_return = "http://www.somedomain.net/cancel.html";
[*]no_note = "1";
[*]currency_code = _parent.theCur;
[*]getURL("https://www.paypal.com/cgi-bin/webscr", "_blank", "POST");
[*]}
[/LIST]

Now how can I fix the amount to $5.00 so that the user can no other option but to pay $5.00.

Please advise me.

worthless