Add checkout button to product page.
I found this useful on the forum and made the codes into a mod.
I'm a end user too, not an developer, there is no support for this, this is a open-source sharng of codes.
Thanks.
If you want to see how it works, see here on my site.
http://www.tayoutec.com/index.php?route=product/product&product_id=81

If you are using a onepage checkout module, you need to change the route in the followin code to yours:
$this->data['checkout']= $this->url->link('check/checkout',
Change the first "checkout" to your rout. It will work.