Hi
You can use javascript within the onClick event of the buttons.
Here is the code:
<Script Language = "Javascript">
function to_addtocart_page()
{
window.location.href="addtocart_processing.php";
}
</Script>
<?php
<input type = "button" name = "addtocart" value = "add to cart" onClick = "to_addtocart_page()">
<input type = "button" name = "page_back" value = "continue shopping" onClick = "window.back()">
?>
Let me know if this works
langals