I'm setting up authorize.net SIM with my shopping cart. Just submitted a test transaction and everything worked perfectly EXCEPT when being redirected back to my cart to show the order confirmation, the security dialog box came up with the "do you want to proceed" yes or no thing in IE. My checkout pages on the cart are not https because I'm not collecting any credit card data. Why is the dialog box coming up? Does the very act of going from https to http cause this? Is there a fix?