function contactCheck() {
var themessage = "Lutfen Bos Alanlari Doldurunuz: ";
if (document.form.firstname.value=="") {
themessage = themessage + "\n * Isim";
}
if (document.form.lastname.value=="") {
themessage = themessage + "\n * Soyadi";
}
if (document.form.email.value=="") {
themessage = themessage + "\n * Email";
}
if (document.form.comment.value=="") {
themessage = themessage + "\n * Sorunuz";
}
if (document.form.phone.value==""){
themessage = themessage + "\n * Telefon No";
}

if (document.form.subject.value==""){
themessage = themessage + "\n * Konu";
}

//alert if fields are empty and cancel form submit
if (themessage == "Lutfen Bos Alanlari Doldurunuz: ") {
document.contact.submit();
}

else {
alert(themessage);
return false;
   }
}