Javacript to open iframe submit button in new window

[inhouse]

Hello,

I have my shopping cart embedded in an iframe on my site (so my client can edit the cart price/options within ShopSite and not have to edit code). The cart fits nicely in the body of my site; however, I need the submit button to open a new window in order to have visitors check out in a secure environment. I've heard there is javascript necessary outside of my form HTML but I'm not sure how this would work or where I'd place the script. Site can be found at http://useinhouse.com/ProTech/order-heating-oil-test3/ . Everything still needs fine tuning but I'd really like to get this functioning first. I received help in designing the cart to mimic my website, but being WordPress built, I don't want to have to edit the cart nav every time the nav changes on the site, etc. Thanks in advance.

Edit: I've tried using target="_blank" which doesn't work. I've also read other forums where others have tried this to no avail.

[inhouse]

Ok, so I've been Googling and found a few tutorials but I can't make them work with my Add to Cart button. Is anyone better versed with Javascript that can help me out? The tutorials say to place a bit of script into the head and then modify the form button with the provided script. I placed the script into the "header" include. This type of thing is new to me. Any pointers would be greatly appreciated.

http://www.javascriptkit.com/script/script2/form2popup.shtml
http://javascript.internet.com/forms/form-target-formatting.html

[ShopSite David]

FYI, an IFrame Option for Order Anywhere was just added to v11 sp1. See:
http://shopsite.com/help/11.1/en-US/new-features.html