function validateFormOnSubmit(theForm) {
var reason = "";

  reason += validateNavn(theForm.navn);
  reason += validateNavn(theForm.adresse);
  reason += validateNavn(theForm.ny_adresse);
  reason += validatePostnr(theForm.post_nr);
  reason += validateTlf(theForm.telefon);
  reason += validateNavn(theForm.banknavn);
  reason += validateKonto(theForm.bankkonto);
  reason += validateRegnr(theForm.reg_nr);
  reason += validateEmpty(theForm.malerafls_dato);
  reason += validateEmpty(theForm.malerafls_energi);
  reason += validateEmpty(theForm.malerafls_m3);
  reason += validateEmpty(theForm.malerafls_timer);
  reason += validateNavn(theForm.tilflytter_navn);
  reason += validateTlf(theForm.tilflytter_tlf);
  reason += validateNavn(theForm.ejer);
  reason += validateNavn(theForm.lejer);
      
  if (reason != "") {
    alert("Nogle felter er ikke udfyldt korrekt:\n" + reason);
    return false;
  }

  return true;
}

function validateEmpty(fld) {
    var error = "";
  
    if (fld.value.length == 0) {
        fld.style.background = 'red';
        fld.style.color = 'white'; 
        error = "Feltet er ikke udfyldt\n"
    } else {
        fld.style.background = 'white';
    }
    return error;   
}

function validateNavn(fld) {
    var error = "";
    var illegalChars = /w/;
 
    if (fld.value == "") {
        fld.style.background = 'red';
        fld.style.color = 'white'; 
        error = "Dette er ikke et navn.\n";
    } else if (illegalChars.test(fld.value)) {
        fld.style.background = 'red';
        fld.style.color = 'white'; 
        error = "Ugyldige karakterer.\n";
    } else {
        fld.style.background = 'white';
    } 
    return error;
}

function trim(s)
{
  return s.replace(/^\s+|\s+$/, '');
} 

function validateEmail(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    
    if (fld.value == "") {
        fld.style.background = 'red';
        fld.style.color = 'white';
        error = "Indtast venligst din email adresse.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'red';
        fld.style.color = 'white';
        error = "Indtast venligst en gyldig email adresse.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'red';
        fld.style.color = 'white';
        error = "Dette er ikke en gyldig email adresse.\n";
    } else {
        fld.style.background = 'white';
    }
    return error;
}

function validateDato(fld) {
    var error="";
    var tfld = trim(fld.value);                        // value of field with whitespace trimmed off
    var emailFilter = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
    var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/ ;
    
    if (fld.value == "") {
        fld.style.background = 'red';
        fld.style.color = 'white';
        error = "Indtast venligst datoen.\n";
    } else if (!emailFilter.test(tfld)) {              //test email for illegal characters
        fld.style.background = 'red';
        fld.style.color = 'white';
        error = "Indtast venligst datoen.\n";
    } else if (fld.value.match(illegalChars)) {
        fld.style.background = 'red';
        fld.style.color = 'white';
        error = "Skriv venligst i dette format: 27-03-94.\n";
    } else {
        fld.style.background = 'white';
    }
    return error;
}

function validatePostnr(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (fld.value == "") {
        error = "Indtast venligst postnummeret.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else if (isNaN(parseInt(stripped))) {
        error = "Indtast venligst et gyldigt postnummer.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else if (!(stripped.length == 4)) {
        error = "Ugyldigt postnummer. Brug 4 tegn.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else {
        fld.style.background = 'white';
    }
    return error;
}

function validateTlf(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (fld.value == "") {
        error = "Indtast venligst et telefonnummer.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else if (isNaN(parseInt(stripped))) {
        error = "Indtast venligst et gyldigt telefonnummer.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else if (!(stripped.length == 8)) {
        error = "Brug kun 8 tegn. Der skal ikke inkluderes landekode.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else {
        fld.style.background = 'white';
    }
    return error;
}


function validateKonto(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (fld.value == "") {
        error = "Indtast venligst et gyldigt bankkonto nr.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else if (isNaN(parseInt(stripped))) {
        error = "Indtast venligst et gyldigt bankkonto nr.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else if (!(stripped.length == 10)) {
        error = "Brug kun 10 tegn.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else {
        fld.style.background = 'white';
    }
    return error;
}

function validateRegnr(fld) {
    var error = "";
    var stripped = fld.value.replace(/[\(\)\.\-\ ]/g, '');     

   if (fld.value == "") {
        error = "Indtast venligst et gyldigt registrerings nr.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else if (isNaN(parseInt(stripped))) {
        error = "Indtast venligst et gyldigt registrerings nr.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
        fld.style.color = 'white';
    } else if (!(stripped.length == 4)) {
        error = "Brug kun 4 tegn.\n";
        fld.style.background = 'red';
        fld.style.color = 'white';
    } else {
        fld.style.background = 'white';
    }
    return error;
}