function ValidateSignUp(Form)
 {
 
  element = document.getElementById('contactDateNewsLetter');
    
  if (element.value != "")
  {
   return false;
  }
  
        element = Form.txtEmail;
        if (element.value == "")      
        {
                    alert('Please enter your email');
                    element.focus();
                    return false;
        }
        if (ValidateEmailNewsletter(element.value))
        {
   element = document.getElementById('NewsletterSignUp');
   element.value = 'Yes';
   return true;
   //document.forms[0].submit();
        }
  else{
   alert("Please check your email.");
   element.focus();
   return false;
  }
 }
	
	function ValidateEmailNewsletter(valor) 
    {
     if (/\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/.test(valor))
      return true;
     else
      return false;
    }