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<script type="text/javascript">
<!--
function getContinueShoppingURL(form){

// -- Get the href of the currently displayed webpage --
form.shopping_url.value = window.location.href;
}
//-->
</script>
...

<form target="paypal" action="https://www.paypal.com/cgi-bin/webscr"
        method="post">

    <!-- Identify your business so that you can collect the payments. -->
    <input type="hidden" name="business" value="kin@kinskards.com">

    <!-- Specify a PayPal Shopping Cart Add to Cart button. -->
    <input type="hidden" name="cmd" value="_cart">
    <input type="hidden" name="add" value="1">

    <!-- Specify details about the item that buyers will purchase. -->
    <input type="hidden" name="item_name"
        value="Birthday Card - Cake and Candle">
    <input type="hidden" name="amount" value="3.95">
    <input type="hidden" name="currency_code" value="USD">

    <!-- Continue shopping on the current webpage of the merchant site. -->
    <!-- The below value is replaced when buyers click Add to Cart -->
    <input type="hidden" name="shopping_url"
        value="http://www.kinskards.com/birthday_cards">

    <!-- Display the payment button. -->
    <input type="image" name="submit" border="0"
        onclick=getContinueShoppingURL(this.form)
        src="https://www.paypalobjects.com/en_US/i/btn/btn_cart_LG.gif"
        alt="PayPal - The safer, easier way to pay online">
    <img alt="" border="0" width="1" height="1"
        src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" >
</form>