Paypal buy it now button not doing anything - html

Question

Im sure this is obvious but I can't seem to get the auto-generated paypal code to work with my site. I see no debug errors. The button just does nothing when it is clicked. Any help would be appreciated
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<div class="background_subpages">
<div id="shirtsBG" class="RoundBorder">
<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="business" value="xxxx#gmail.com">
<input type="hidden" name="lc" value="US">
<input type="hidden" name="item_name" value="Green">
<input type="hidden" name="button_subtype" value="services">
<input type="hidden" name="no_note" value="0">
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="bn" value="PP-BuyNowBF:btn_buynowCC_LG.gif:NonHostedGuest">
<table>
<tr><td><input type="hidden" name="on0" value="Sizes">Sizes</td></tr><tr><td><select name="os0">
<option value="Small">Small $11.99 USD</option>
<option value="Medium">Medium $11.99 USD</option>
<option value="Large">Large $11.99 USD</option>
</select> </td></tr>
</table>
<input type="hidden" name="currency_code" value="USD">
<input type="hidden" name="option_select0" value="Small">
<input type="hidden" name="option_amount0" value="11.99">
<input type="hidden" name="option_select1" value="Medium">
<input type="hidden" name="option_amount1" value="11.99">
<input type="hidden" name="option_select2" value="Large">
<input type="hidden" name="option_amount2" value="11.99">
<input type="hidden" name="option_index" value="0">
<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_buynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
</div>

Answer 1

It was because I was using a form within a form. This code in my page load did the trick
if (!IsPostBack)
{ }
else { }
Form.Action = "https://www.paypal.com/cgi-bin/webscr";
Form.Method = "post";