function Validate()
{
  var IsValid = true;

  document.getElementById("NameERR").innerText = "";
  document.getElementById("phoneERR").innerText = "";
  document.getElementById("EmailERR").innerText = "";
  document.getElementById("subjectERR").innerText = "";

  // Check for a name
  if (document.getElementById("name").value == "") {
    document.getElementById("NameERR").innerText = "Введите имя";
    IsValid = false;
  }
  // Check for an address
  if (document.getElementById("phone").value == "") {
    document.getElementById("phoneERR").innerText = "Введите телефон";
    IsValid = false;
  }	
   // Check for an subject
  if (document.getElementById("subject").value == "") {
    document.getElementById("subjectERR").innerText = "Введите предметы";
    IsValid = false;
  }	
  // Check for a valid email address
  var ValidEmail = false;
  for (i=0; i<document.getElementById("email").value.length; i++) {
    if (document.getElementById("email").value.charAt(i) == "@") {
      ValidEmail = true;
      break;
    }
  }
  if (ValidEmail == false) {		
    document.getElementById("emailERR").innerText = "Неверный формат email";
    IsValid = false;
  }	

  return IsValid;

}

// JavaScript Document