function checkblanks(aForm) {
	var ok = true;
	var element;
	for(i = 0; i < aForm.elements.length; i++) {
		element = aForm.elements[i];
		if(element.type == "text" || element.type == "textarea") {
			element.style.border = "solid #000000 1px";
			if(element.value == "") {
				element.style.border="solid #FF0000 1px";
				ok = false;
			}
		} 
	}
	if(!ok) {
		return false;
	} else {
		return true;
	}
}

function clearonclick(id) {
	document.getElementById(id).value = "";
}

function isValidEmail(email, required) {
    if (required==undefined) {   // if not specified, assume it's required
        required=true;
    }
    if (email==null) {
        if (required) {
            return false;
        }
        return true;
    }
    if (email.length==0) {  
        if (required) {
            return false;
        }
        return true;
    }
    if (! allValidChars(email)) {  // check to make sure all characters are valid
        return false;
    }
    if (email.indexOf("@") < 1) { //  must contain @, and it must not be the first character
        return false;
    } else if (email.lastIndexOf(".") <= email.indexOf("@")) {  // last dot must be after the @
        return false;
    } else if (email.indexOf("@") == email.length) {  // @ must not be the last character
        return false;
    } else if (email.indexOf("..") >=0) { // two periods in a row is not valid
	return false;
    } else if (email.indexOf(".") == email.length) {  // . must not be the last character
	return false;
    }
    return true;
}

function allValidChars(email) {
  var parsed = true;
  var validchars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";
  for (var i=0; i < email.length; i++) {
    var letter = email.charAt(i).toLowerCase();
    if (validchars.indexOf(letter) != -1)
      continue;
    parsed = false;
    break;
  }
  return parsed;
}

function validate_mailsubmit(aForm) {
  if (!isValidEmail(aForm.elements['email'].value)) {
      alert("De angivne email-adresse er ikke gyldig");
      return false;
  }
  if(!checkblanks(aForm)) {
	alert("Du har ikke udfyldt alle felter");
	return false;
  } else {
	aForm.submit();
	return true;
  }
}