function check() {
    var checkin=document.booking.checkin
    var checkin_checked=document.booking.checkin_checked
    var init_checkin=document.booking.init_checkin
    var firstname=document.booking.firstname
    var lastname=document.booking.lastname
    var address=document.booking.address
    var phone=document.booking.phone
    var email=document.booking.email
    var cardnum=document.booking.cardnum
    var totalcost=document.booking.totalcost

    if ((init_checkin.value==checkin.value) && (checkin_checked.value==0)){
	alert("Are you sure you want to check in today?")
	document.booking.checkin_checked.value=1
	return false
    }
    if ((totalcost.value==0) ||(totalcost.value=="")||(totalcost.value==null)){
	alert("Please specify the number of rooms!")
	return false
    }
    if ((firstname.value==null)||(firstname.value=="")){
	alert("Please enter your first name!")
	firstname.focus()
	return false
    }
    if ((lastname.value==null)||(lastname.value=="")){
	alert("Please enter your last name!")
	lastname.focus()
	return false
    }
    if ((address.value==null)||(address.value=="")){
	alert("Please enter your address!")
	address.focus()
	return false
    }
    if ((email.value==null)||(email.value=="")){
	alert("Please enter your email address!")
	email.focus()
	return false
    }
    if ((cardnum.value==null)||(cardnum.value=="")){
	alert("Please enter your card number!")
	cardnum.focus()
	return false
    }

    
    return true
							    

}