var http_request = false;
   function makePOSTRequest(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

   function alertContents() {

	document.getElementById("button").disabled = true;
	document.getElementById("fio").value = "";
	document.getElementById("email").value = "";
	document.getElementById("comment").value = "";
   
   document.getElementById('myspan').style.opacity = 5/10;
   document.getElementById('myspan').style.filter = 'alpha(opacity=' + 5*10 + ')';
   document.getElementById('myspan').style.display = "block";
   document.getElementById('myspan').innerHTML = "Please wait...";

   
   
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;

	    document.getElementById('myspan').style.textAlign = "center";
	    document.getElementById('myspan').style.verticalAlign = "middle";
//	    document.getElementById('myspan').style.paddingTop = 80;
	    document.getElementById('myspan').style.fontWeight = "bolder";
	    document.getElementById('myspan').style.color = "black";
//	    document.getElementById('myspan').style.fontSize = "2em";
	    document.getElementById('myspan').style.backgroundColor = "white";
	    document.getElementById('myspan').style.opacity = 10;
	    document.getElementById('myspan').style.filter = 'alpha(opacity=' + 100 + ')';



            document.getElementById('myspan').innerHTML = "Message has been sent<br>"+result+", thank you for your letter!";
         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
   function get(obj) {
   
   if(document.getElementById("fio").value == "") {alert("Please enter your name"); return false;}
   if(document.getElementById("comment").value == "") {alert("Please enter the text"); return false;}
   
      var poststr = "fio="+escape(encodeURI(document.getElementById("fio").value))+"&email=" +encodeURI(document.getElementById("email").value)+"&comment="+encodeURI(document.getElementById("comment").value);
	
      makePOSTRequest('letter.php', poststr);
   }