function validateEmail(obj, naam)
{
  melding = "E-mail adres is niet geldig"

  if (languageKeyword == 'UK')
  {
    melding = "Email address is invalid"
  }

  var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
  if (!(re.test(obj.value)))
  {
    alert(melding);
    obj.focus();
    return(false);
  }

  return(true);
}

function controleerNumberRangeMetMelding(obj, minVal, maxVal, naam)
{
  melding1 = "Minimale waarde voor veld " + naam + " is " + minVal
  melding2 = "Maximale waarde voor veld " + naam + " is " + maxVal

  if (languageKeyword == 'UK')
  {
    melding1 = "Minimum value of " + naam + " is " + minVal
    melding2 = "Maximum value of " + naam + " is " + maxVal
  }

  if (eval(minVal) > eval(obj.value))
  {
    alert(melding1);
    obj.focus();
    return(false);
  }

  if (eval(obj.value) > eval(maxVal))
  {
    alert(melding2);
    obj.focus();
    return(false);
  }

  return(true);
}

function controleerVeldIngevuld(obj, naam)
{
  melding1 = "Veld " + naam + " is verplicht"

  if (languageKeyword == 'UK')
  {
    melding1 = "Field " + naam + " is required"
  }

  if (obj.value == "")
  {
    alert(melding1);
    obj.focus();
    return (false);
  }
  return(true);
}

function controleerVeldIngevuldNoFocus(obj, naam)
{
  melding1 = "Veld " + naam + " is verplicht"

  if (languageKeyword == 'UK')
  {
    melding1 = "Field " + naam + " is required"
  }

  if (obj.value == "")
  {
    alert(melding1);
    return (false);
  }
  return(true);
}

function controleerLengteString(obj, minNumChars, maxNumChars, numChars, naam)
{
  if (!controleerLengteStringByValue(obj.value, minNumChars, maxNumChars, numChars, naam))
  {
    obj.focus();
    return(false);
  }
  return (true);
}

function controleerLengteStringZonderMelding(obj, minNumChars, maxNumChars, numChars)
{
  if (numChars != obj.value.length && 0 < numChars)
  {
    return(false);
  }

  if (minNumChars > obj.value.length && 0 <= minNumChars)
  {
    return(false);
  }

  if (maxNumChars < obj.value.length && 0 <= maxNumChars)
  {
    return(false);
  }

  return (true);
}

function controleerLengteStringByValue(objValue, minNumChars, maxNumChars, numChars, naam)
{
  melding1 = "Het veld " + naam + " moet uit " + numChars + " karakters bestaan";
  melding2 = "Het veld " + naam + " bevat te weinig karakters (minimaal: " + minNumChars + ")";
  melding3 = "Het veld " + naam + " bevat te veel karakters (maximaal: " + maxNumChars + ")";

  if (languageKeyword == 'UK')
  {
    melding1 = "This record has to consist of " + numChars + " characters";
    melding2 = "This record requires a minimum number of characters of " + minNumChars;
    melding3 = "This record requires a maximum number of characters of " + maxNumChars;
  }

  if (numChars != objValue.length && 0 < numChars)
  {
    alert(melding1);
    return(false);
  }

  if (minNumChars > objValue.length && 0 <= minNumChars)
  {
    alert(melding2);
    return(false);
  }

  if (maxNumChars < objValue.length && 0 <= maxNumChars)
  {
    alert(melding3);
    return(false);
  }

  return (true);
}

function checkStringContentMetMelding(obj, allowedChars, naam)
{
  melding1 = "In het veld " + naam + " komen karakters voor die niet zijn toegestaan (toegestaan: " + allowedChars + ")"

  if (languageKeyword == 'UK')
  {
    melding1 = "Characters in string that are not allowed (allowed: " + allowedChars + ")"
  }

  for (var i = 0; i < obj.value.length; i++)
  {
    var c = obj.value.charAt(i)

    if (allowedChars.indexOf(c) == -1)
    {
      alert(melding1);
      obj.select();
      obj.focus();
      return (false);
    }
  }

  return (true);
}

function controleerIntegerSyntaxMetMelding(obj, naam)
{
  melding1 = "In veld " + naam + " mogen alleen getallen worden ingevoerd"

  if (languageKeyword == 'UK')
  {
    melding1 = "Field " + naam + " only allows numbers"
  }

  for (var i=0;i<obj.value.length;i++)
  {
    var digit=obj.value.charAt(i)
    if ((!(digit >= "0" && digit <= "9")) && (!(digit == "-")))
    {
      alert(melding1);
      obj.focus();
      return (false);
    }
  }
  return(true);
}

function controleerFloatSyntaxMetMelding(obj, naam)
{
  melding1 = "In veld " + naam + " mogen alleen decimale getallen worden ingevoerd"

  if (languageKeyword == 'UK')
  {
    melding1 = "Field " + naam + " only allows decimal numbers"
  }

  sepFound = 0;

  for (var i=0;i<obj.value.length;i++)
  {
    var digit=obj.value.charAt(i)
    if (!(digit >= "0" && digit <= "9") && ((!(digit == ",")) || (digit == "," && sepFound == 1)) && ((!(digit == ".")) || (digit == "." && sepFound == 1)))
    {
      alert(melding1);
      obj.focus();
      return (false);
    }

    if (digit == "," || digit == ".")
    {
      sepFound = 1;
    }
  }
  return(true);
}

function controleerInteger(getal)
{
  for (var i=0;i<getal.length;i++)
  {
    var digit=getal.charAt(i)
    if (!(digit >= "0" && digit <= "9"))
    {
      return (false);
    }
  }
  return(true);
}

function controleerFloat(getal)
{
  for (var i=0;i<getal.length;i++)
  {
    var digit=getal.charAt(i)
    if (!(digit >= "0" && digit <= "9") && !(digit == ".") && !(digit == ","))
    {
      return (false);
    }
  }
  return(true);
}