Confirmation function needs to stay checked....

Confirmation function needs to stay checked if a user hits teh back button or if the page has errors. I am using the following code:

  function confirmation() {
			if (document.customer.b_offline.checked==true){
				var answer = confirm("Please click \"OK\" if you would prefer to give your credit card number over the phone. Complete your order online then call 800-300-9993 to give us your credit card number. Click \"Cancel\" to complete your order in our guaranteed secure shopping cart.")
				if (answer){
					document.customer.cc_number.disabled = true;
					document.customer.cc_type.disabled = true;
					document.customer.fstore_payment.disabled = true;
					document.customer.cc_month_expire.disabled = true;
					document.customer.cc_year_expire.disabled = true;
					document.customer.cc_scode.disabled = true;
					document.customer.b_skip_cvv_1.disabled = true;
					document.customer.b_skip_cvv_2.disabled = true;
					document.customer.b_offline.checked = true;
				}
				else{
					document.customer.cc_number.disabled = false;
					document.customer.cc_type.disabled = false;
					document.customer.fstore_payment.disabled = false;
					document.customer.cc_month_expire.disabled = false;
					document.customer.cc_year_expire.disabled = false;
					document.customer.cc_scode.disabled = false;
					document.customer.b_skip_cvv_1.disabled = false;
					document.customer.b_skip_cvv_2.disabled = false;
					document.customer.b_offline.checked = false;
				}
			}
			else{
				document.customer.cc_number.disabled = false;
				document.customer.cc_type.disabled = false;
				document.customer.fstore_payment.disabled = false;
				document.customer.cc_month_expire.disabled = false;
				document.customer.cc_year_expire.disabled = false;
				document.customer.cc_scode.disabled = false;
				document.customer.b_skip_cvv_1.disabled = false;
				document.customer.b_skip_cvv_2.disabled = false;
				document.customer.b_offline.checked = false;
			}
        }

Code (markup):