Here's what you gonna do!
make your product!
Convert it into button!
Paste the script below in your button's actions pallete.
Have a nice day!

on (release) {
var formData = new LoadVars();
formData["add"] = "1";
formData.cmd = "_cart";
formData.business = "your_Email_Here@bluhbluh!.com";
formData.item_name = "put_your_item_name_here!";
formData.item_number = " bluhbluhbluh!...";
formData.amount = "your_specified_amount(no dollar sign)";
formData.page_style = "PayPal";
formData.no_shipping = "2";
formData["return"] = "http://www.mowglihaircutters.com/html/payment_status_01.html";
formData.cancel_return = "http://www.mowglihaircutters.com/html/payment_status_02.html";
formData.cn = "Message from customer...";
formData.currency_code = "GBP";
formData.lc = "GB"
formData.bn = "PP-ShopCartBF"
formData.send("https://www.paypal.com/cgi-bin/webscr", "_blank", "GET");
}