function confirmGuestbook() {
	problem = false
	if (document.checkout.first_name.value == ""){
		problem = true
		alert ("Please enter your first name.")
		document.checkout.first_name.focus()
	}
	if (document.checkout.last_name.value == ""){
		problem = true
		alert ("Please enter your last name.")
		document.checkout.last_name.focus()
	}
	if (document.checkout.email.value == "" && !problem){
		problem = true
		alert ("Please enter your address.")
		document.checkout.email.focus()
	}
	if (!problem){
		document.checkout.elements[0].value = "yes"
		document.checkout.submit()
	}
}