function checkform ( form )
{
// ** START **
if (form.name.value == "") {
alert( "Please fill all required filelds: name" );
form.name.focus();
return false ;
}
if (form.surname.value == "") {
alert( "Please fill all required filelds: surname" );
form.surname.focus();
return false ;
}
if (form.email.value == "") {
alert( "Please fill all required filelds: email" );
form.email.focus();
return false ;
}
if (form.telefon.value == "") {
alert( "Please fill all required filelds: phone number" );
form.telefon.focus();
return false ;
}

// ** END **
return true ;
}