function validateForm()
{
  var emailregex = /^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$/
  var blankregex = /^\s*$/i
  var email = document.getElementById("emailid");
  
  if(!emailregex.test(email.value))
  {
      alert("Please provide a valid email address.");
      email.focus();
      return false;
  }
 return true;
}