function check(el) {
    var elem = document.getElementById(el);
    if (elem.value == '') {
        elem.style.backgroundColor='#dd6666';
        return false;
   } else {
        elem.style.backgroundColor='#ffffff';
        return true;
  }
}

function check_order_form(){
    var a = check('form_email') ;
    var b = check('form_name') ;
    var c = check('form_phone') ;
    if (!(b && (c || a))) {
       return false;
   }
    
   return true;
}

function check_fdb_form(){
    var a = check('form_email') ;
    var b = check('form_name') ;
    var c = check('form_msg') ;
    if (!(b && c && a)) {
       return false;
   }
    
   return true;
}