Thanks llegrand,
But that only provides an implied acceptance of terms. I am looking to have a checkbox that the customer has to specifically tick.

Thanks Basara, that works perfectly!

I'm embedding into a static site, just about have it as I want but there are two checkout issue. I'm using fast checkout in the modal “Same page modal dialogue”:

In the Shopping cart page the + & - buttons do not function.
In the address page there is no indication (red fields with !) if fields are not filled in.

They both work fine in “open new page in new tab” & “open new page in same window”.
Can they be made to function in the “Same page modal dialogue”​?

My embedded test pages have started to behave differently. This includes the one linked to in my previous post https://forum.abantecart.com/index.php/topic,10739.0.html
Previously the Add To Cart button opened the shopping cart, now it just adds to the total, showing the cart icon. Clicking the cart icon then opens it. Clicking on the picture also opens the cart.
Thinking that I may have messed up the settings I did a fresh AbanteCart install in a new folder, I changed nothing, leaving all settings as installed. I then created a test page from a new clean html file, pasting the auto generated code from the new install with exactly the same results. Tried with modal, cart in new window & cart in same window, all with the same results. Tried in several browsers on two computers. Sample pages were created using a test item with no options.
I'm quite happy with it working this way, less clicks for the customers. I assume I'm missing something (probably obvious) in the settings, if so I need to know what before I unintentionally change things again.

I'm setting up AbanteCart for use with an existing static website. Embedding is just about there but I'm having issues with the modal box for cart/checkout. I have a fixed navbar, using DD Smoothmenu, loaded from a separate html page with Javascript. if the page is not scrolled the modal box sits on top of the menu (& all other page elements), where it needs to be. When the page is scrolled the menu moves to the top of the page, as required but the modal box then sits behind the menu with the top half of the title bar obscured. I've tried adjusting the z-index setting for the html page elements but it's made no difference.
Ideally I would like to either adjust the z position of the modal box or to move it a few pixels down the page. I've tried to identify the relevant AbanteCart files without much success. If someone could advise me on which files I need to change it would be appreciated.
Also knowing which files are needed to edit the title bar would be useful.