function cookie_set(numdays){
    var today = new Date();  
    var tt = today.setTime( today.getTime() ); 
    var ext = tt + (1000*60*60*24*numdays);
    var expiry = new Date(ext);
        
    document.cookie="phone="+document.form_booking.phone.value+";expires="+expiry;     
    document.cookie="door_num="+document.form_booking.door_num.value+";expires="+expiry; 
}

function check_form_booking(cookie_days){
    cookie_set(cookie_days);
    var bordcol = "#ff0000"; var baccol = "#ffaaaa"; 
    var f = document.form_booking;
    var numbers = new Array(f.door_num,f.phone);
    for(i=0; i< numbers.length; i++){
        numbers[i].style.border = "1px dashed #aaaaaa";   
        numbers[i].style.background = "#eee";        
        if(numbers[i].value == ""){
            numbers[i].style.border = "2px solid "+bordcol;// 
            numbers[i].style.background = baccol;
            return false;
        }      
    }
    return true;
}