function emailCheck(email_test) {
  
  var emailStr = document.getElementById(email_test).value;
  var checkTLD=1;
  var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
  var emailPat=/^(.+)@(.+)$/;
  var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
  var validChars="\[^\\s" + specialChars + "\]";
  var quotedUser="(\"[^\"]*\")";
  var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
  var atom=validChars + '+';
  var word="(" + atom + "|" + quotedUser + ")";
  var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
  var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
  var matchArray=emailStr.match(emailPat);

  if (matchArray==null) {
    alert("email is invalid, please provide a valid email");
	
    return false;
  }
  var user=matchArray[1];
  var domain=matchArray[2];

  for (i=0; i<user.length; i++) {
    if (user.charCodeAt(i)>127) {
     alert("Ths username contains invalid characters.");
	  document.getElementById(email_test).focus();
     return false;
    }
  }

  for (i=0; i<domain.length; i++) { 
      if (domain.charCodeAt(i)>127) {
        alert("Ths domain name contains invalid characters.");
	    document.getElementById(email_test).focus();

        return false;
      }
  }

  if (user.match(userPat)==null) {
    alert("The username doesn't seem to be valid.");
	 document.getElementById(email_test).focus();

    return false;
  }

  var IPArray=domain.match(ipDomainPat);
  if (IPArray!=null) {
     for (var i=1;i<=4;i++) {
         if (IPArray[i]>255) {
            alert("Destination IP address is invalid!");
		    document.getElementById(email_test).value.focus();

            return false;
         }
     }
     return true;
  } // end if

  var atomPat=new RegExp("^" + atom + "$");
  var domArr=domain.split(".");
  var len=domArr.length;
  for (i=0;i<len;i++) {
   if (domArr[i].search(atomPat)==-1) {
      alert("The domain name does not seem to be valid.");
	  document.getElementById(email_test).focus();

      return false;
   }
  }

  if (checkTLD && domArr[domArr.length-1].length!=2 && 
   domArr[domArr.length-1].search(knownDomsPat)==-1) {
   alert("The address must end in a well-known domain or two letter " + "country.");
   document.getElementById(email_test).focus();

   return false;
  }

  if (len<2) {
   alert("This address is missing a hostname!");
   document.getElementById(email_test).focus();
   return false;
  }
 return true;
} // end function

// end function



function formSubmitNewsletter()
{
	if ( document.getElementById('newsletter_email').value == '' )
	{
		 alert('Please, enter required email address.');
		 document.getElementById('newsletter_email').focus();
	}
   else
   {
   	load_news_form();                           
   }
}



function get_val(id_name)
{
	return document.getElementById(id_name).value;
}

function load_news_form()
{  
   //alert('test');
	xmlhttp= (window.XMLHttpRequest ? new XMLHttpRequest(): ((window.ActiveXObject) ? new ActiveXObject("Microsoft.XMLHTTP") : null) );
	xmlhttp.onreadystatechange=state_change
	xmlhttp.open("POST",'news-letter.php',false)
	xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	var send_val = '';
	if ( get_val('newsletter_submit') == 'newsletter_submit' ) 
	{   
	    send_val= 'newsletter_submit='+get_val('newsletter_submit')+'&newsletter_email='+get_val('newsletter_email'); 
	}
	
 	xmlhttp.send(send_val);
	document.getElementById('div_news_letter').innerHTML= xmlhttp.responseText;
	//alert(xmlhttp.responseText);
}

function state_change()
{
  //alert ('dasd'+xmlhttp.responseText)
  if (xmlhttp.readyState==4)
  {
 
  }
}