To make your web form thank you page open in a new browser tab or window you'll have to follow these simple steps.
First, you won't be able to use the "script code" but instead will need the full "form code" from 1Shoppingcart web form manager. After you're done building the form, copy the form code provided out of 1Shoppingcart and into the page where you want your form to appear.
Next, you'll want to find the beginning of the form. It looks like this: <form
Next, add this small line of code:
Finally, save and test the form. It should open in a new browser window leaving the original page with the form still open as well.