w_['startwith']="list";

<form action='https://www.paypal.com/cgi-bin/webscr' method='post'>
<input type='image' src='https://www.paypal.com/en_US/i/btn/btn_buynowCC_LG.gif' border='0' name='submit' alt='Buy now.'>
<img alt='' border='0' src='https://www.paypal.com/en_US/i/scr/pixel.gif' width='1' height='1'>
<input type='hidden' name='cmd' value='_xclick'>
<input type='hidden' name='business' value='yourpaypalemail'>
<input type='hidden' id='item_name' name='item_name' value='Entry fee for entry <$entrynumber$>'>
<input type='hidden' name='item_number' value='<$entrynumber$>'>
<input type='hidden' name='no_shipping' value='1'>
<input type='hidden' name='return' value='http://www.yourwebsite.com'>
<input type='hidden' name='cancel_return' value='http://www.yourwebsite.com'>
<input type='hidden' name='no_note' value='1'>
<input type='hidden' name='currency_code' value='USD'>
<input type='hidden' name='lc' value='US'>
<input type='hidden' name='bn' value='PP-BuyNowBF'>
<input id='price' type='hidden' name='amount' value='35.00'>
<form>

Are you a Member? <select id=membership><option value=u><option value=y>Yes, I am a member<option value=n>No, I am not a member</select>

onsubmit='return checkPaypal();'

function checkPaypalPayment() {
if ($('membership').value=='u') {
alert('Ooops. Please indicate whether you are a member or not.');
return false;
}
$('item_name').value=($('membership').value=='y'?'Member':'Non-Member')+" entry fee for entry <$entrynumber$>";
var price;
if ($('membership').value=='y') {
if (currrevisions.length<=3) price=30;
else price=40;
}
else {
if (currrevisions.length<=3) price=40;
else price=50;
}
if (currrevisions.length>5) price+=5*(currrevisions.length-5);
$('price').value=price+".00";
return true;
}