function checkFields() {
missinginfo = "";
if (document.form.realname.value == "") {
missinginfo += "\n - Name";
}
if ((document.form.email.value == "") || 
(document.form.email.value.indexOf('@') == -1) || 
(document.form.email.value.indexOf('.') == -1)) {
missinginfo += "\n - Email:";
}
if(document.form.arende.value == "") {
missinginfo += "\n - Message:";
}
if (missinginfo != "") {
missinginfo ="You have to fill in :\n" +
"________________________________\n" +
missinginfo + 
"\n________________________________" +
"\n...before submiting your message";
alert(missinginfo);
return false;
}
else return true;
}