function validateform() {
 for(var i=0; i<fields.length; i++) {
  if (document.f.elements[fields[i]].value == '' || document.f.elements[fields[i]].value == 0) {
   alert(fields_info[i]);
   document.f.elements[fields[i]].focus();
   return false;
  }
 }
 if (validateemail(document.f.elements['email'].value)) {
  return true;
 } else {
  return false;
 } 
}

function validateemail(t) {
  maska = /^[0-9a-z_.-]+@([0-9a-z-]+.)+[a-z]{2,4}$/;
  if (maska.test(t)==false) { 
    alert("Podaj poprawny adres e-mail");
    document.f.elements['email'].focus();
    return false;
  }
  return true;
}

function getinfo(fieldname, myid) {
	advAJAX.post({
	    url: "getinfo.php",
	    parameters : {
	      "id" : myid
	    },
		onSuccess : function(obj) {
			document.getElementById(fieldname).innerHTML = obj.responseText;
		},
		onError : function(obj) {
			alert("Error: " + obj.status);
		}
	});
}