function validate_text(myform) {
  if (myform.names.value == "" || myform.names.value == null || myform.names.value.length >= 200) {
    alert("Please fill in field Name. You have 200 symbols availability.\nSymbols now: " + myform.names.value.length);
    myform.names.focus();
    return false;
  }

  if (myform.email.value == "" || myform.email.value == null || myform.email.value.length >= 70) {
    alert("Please fill in field E-mail. You have 70 symbols availability.\nSymbols now: " + myform.email.value.length);
    myform.email.focus();
    return false;
  }

  if (myform.title.value == "" || myform.title.value == null || myform.title.value.length >= 70) {
    alert("Please fill in field Title. You have 70 symbols availability.\nSymbols now: " + myform.title.value.length);
    myform.title.focus();
    return false;
  }

  if (myform.message.value == "" || myform.message.value == null || myform.message.value.length >= 500) {
    alert("Please fill in field Message. You have 500 symbols availability.\nSymbols now: " + myform.message.value.length);
    myform.message.focus();
    return false;
  }

  if (myform.txtNumber.value == "" || myform.txtNumber.value == null || myform.txtNumber.value.length != 5) {
    alert("Please fill in field Code. You should enter 5 symbols.\nSymbols now: " + myform.txtNumber.value.length);
    myform.txtNumber.focus();
    return false;
  }

  return true;

}

function ok_Email(email) {
  var regex = /^(([\-\w]+)\.?)+@(([\-\w]+)\.?)+\.[a-zA-Z]{2,4}$/;
  if (regex.test(email.value)) {
    return true;
  } else {
    return false;
  }
}

function ok_Form(myform) {
  if (validate_text(myform) == false) {
    return false;
  }

  if (ok_Email(myform.email) == false) {
    alert("Please input valid e-mail address.");
    myform.email.focus();
    myform.email.select();
    return false;
  }

  return true;
}



function submitform()
{
  if (ok_Form(document.myform)) {
    document.myform.submit();
  }
}