function validate(form) {
  if (validation_rule.get(form.name)) {
    var error = false;
    var rules = validation_rule.get(form.name); 
    for (var i = 0; i < rules.length; i++) {
      var obj = $(form.name + '_' + rules[i].name);
      if (obj) {
        if (! validateElement(form, obj, rules[i].rule)) error = true;
      }
    }
    return ! error;
  } else return true;
}

function validateElement(form, element, rule) {
  if ((rule.required != null) && (element.value.length == 0)) {
    alert(rule.required.msg);
    return false;
  }
  if (rule.sfStringValidator != null) {
    if (! checkString(element.value, rule.sfStringValidator)) return false;
  }
  if (rule.sfNumberValidator != null) {
    if (! checkNum(element.value, rule.sfNumberValidator)) return false;
  }
  if (rule.sfEmailValidator != null) {
    if (! checkEmail(element.value, rule.sfEmailValidator)) return false;
  }
  if (rule.sfUrlValidator != null) {
    if (! checkUrl(element.value, rule.sfUrlValidator)) return false;
  }
  if (rule.sfRegexValidator != null) {
    if (! checkRegex(form, element, rule.sfRegexValidator)) return false;
  }
  if (rule.sfCompareValidator != null) {
    if (! checkCompare(element.value, rule.sfRegexValidator)) return false;
  }
  return true;  
}

function checkUrl(value, rule) {
  if (value.match('/^(http|https|ftp):\/\/(([A-Z0-9][A-Z0-9_-]*)(\.[A-Z0-9][A-Z0-9_-]*)+)/i')) {
    alert(rule.url_error);
    return false
  }
  return true;
}

function checkCompare(form, element, rule) {
  targetelement = $(form.name + '_' + rule.check);
  if (targetelement) {
    if (targetelement.value != element.value) {
      alert(rule.compare_error);
      return false;
    } else return true;
  } else {
    alert(rule.compare_error);
    return false;
  }
}

function checkRegex(value, rule) {
  if (value.match(rule.pattern)) {
    if (value.match == "No") {
      alert(rule.match_error);
      return false;
    } else return true;
  } else {
    if (value.match == "Yes") {
      alert(rule.match_error);
      return false;
    } else return true;
  }
}

function checkNum(value, rule) {
  if (value.length == 0) return true;
  if (parseInt(value)) {
    if (rule.min != null && parseInt(value) < rule.min) {
      alert(rule.min_error);
      return false;
    }
    if (rule.max != null && parseInt(value) > rule.max) {
      alert(rule.max_error);
      return false;
    }
  } else {
    alert(rule.nan_error);
    return false;
  }
  return true;
}

function checkEmail(value, rule) {
  if (! value.match(/\w+([-+.]\w+)*\@\w+([-.]\w+)*\.\w+([-.]\w+)*/)) {
    alert(rule.email_error);
    return false;
  }
  return true;
}

function checkString(value, rule) {
  if (rule.min != null && value.length < rule.min) {
    alert(rule.min_error);
    return false;
  }
  if (rule.max != null && value.length > rule.max) {
    alert(rule.max_error);
    return false;
  }
  if (rule.values != null && rule.values.indexOf(rule.values) < 0) {
    alert(rule.values_error);
    return false;
  }
  return true;
}