HTML using the <a> tag to process a form

[AlanM]

\[code\]<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="POST">....<a class="button" href=""><span>Buy Now</a></form>\[/code\]In the above code how can I use the \[code\]<a>\[/code\] tag to process the form? I don't want to use a submit button since most of my css code only recognized the attribute.