function FormHelper() {

  var me = this;

  this.validate_asZipcode = function(test1, errdisp, disp) {
    if (test1 == null) return false;
    var regx = '^([0-9]{5}(?:-[0-9]{4})?)*$';
    return me.validate_byRegExp(test1, regx, null, errdisp, disp);
  }

  this.validate_asEmail = function(test1, errdisp, disp) {
    if (test1 == null || test1 == '') return false;
    //var regx1 = '^([a-z0-9!#$%&\'*+/=?^_`{|}~-])+@([a-z0-9!#$%&\'*+/=?^_`{|}~-])+\.([a-z0-9]{2,3})';
    var regx1 = '[a-z0-9!#$%&\'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&\'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?';
    var regx2 = 'i';
    return me.validate_byRegExp(test1, regx1, regx2, errdisp, disp);
  }

  this.validate_byLength = function(test1, min, max, errdisp, disp) {
    if (test1.length < min || test1.length > max) {
      if (errdisp != null) errdisp.style.display = disp;
      return false;
    } else {
      if (errdisp != null) errdisp.style.display = 'none';
      return true;
    }
  }

  this.validate_byRegExp = function(test1, regex1, regex2, errdisp, disp) {
    if (test1 == null || regex1 == null) return false;
    var tregx = regex2 == null ? eval('/' + regex1 + '/') : eval('/' + regex1 + '/' + regex2);
    if (test1.search(tregx) > -1) {
      if (errdisp != null) errdisp.style.display = 'none';
      return true;
    } else {
      if (errdisp != null) errdisp.style.display = disp;
      return false;
    }
  }

  this.validate_hasContent = function(test1, errdisp, disp) {
    if (test1 == '' || test1 == null) {
      if (errdisp != null) errdisp.style.display = disp;
      return false;
    } else {
      if (errdisp != null) errdisp.style.display = 'none';
      return true;
    }
  }

  this.validate_isEquivalent = function(test1, test2, errdisp, disp) {
    if (test1 == test2) {
      if (errdisp != null) errdisp.style.display = 'none';
      return true;
    } else {
      if (errdisp != null) errdisp.style.display = disp;
      return false;
    }
  }

  // Helper array for the following functions.
  var kctest1 = new Array(35, 37, 38, 39, 40, 46);

  this.textFieldLengthLimiter = function(event, test1, maxlength) {
    if (test1.length > (maxlength - 1)) {
      var kpe = event || window.event;
      var kc = kpe.charCode || kpe.keyCode;
      if (kc < 32) return true;
      for (var x = 0; x < 6; x++) {
        if (kc == me.kctest1[x]) return true;
      }
      return false;
    }
    return true;
  }

  this.filterTextInputByChar = function(event, obj, chk) {
    var regx;
    var kpe = event || window.event;
    var kc = kpe.charCode || kpe.keyCode;
    if (kc < 32) return true;
    for (var x = 0; x < 6; x++) {
      if (kc == me.kctest1[x]) return true;
    }
    var t = String.fromCharCode(kc);
    regx = eval('/' + chk + '/');
    if (t.search(regx) > -1) return true;
    return false;
  }
}