function checkFields() {
missinginfo = "";
if (document.buyer.fullname.value == "") {
missinginfo += "\n - För- och efternamn";
}
if (document.buyer.street.value == "") {
missinginfo += "\n - Gata";
}
if(document.buyer.postalcode.value == "") {
missinginfo += "\n - Postnummer";
}
if(document.buyer.town.value == "") {
missinginfo += "\n - Stad";
}
if(document.buyer.email.value == "") {
missinginfo += "\n - E-post";
}
if(document.buyer.phone.value == "") {
missinginfo += "\n - Telefon";
}
if(document.buyer.mobile.value == "") {
missinginfo += "\n - Mobiltelefon";
}

if (missinginfo != "") {
missinginfo ="_____________________________\n" +
"Du har inte fyllt i fälten:\n" +
missinginfo + "\n_____________________________" +
"\nFyll i de angivna fälten innan du går vidare!";
alert(missinginfo);
return false;
}
else return true;
}