var http_request = false;
   var myResponse = "Thank You!";
   
   function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}  
   
   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() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            alert(http_request.responseText);
            result = http_request.responseText;
	    //document.getElementById('list_div').innerHTML = result;            
         } else {
	// uncomment for debugging
            // alert('There was a problem with the request.');
         }
      }
   }
   
   function list_post(obj) {
      var poststr = "list_firstname=" + encodeURI( document.getElementById("list_firstname").value ) +
                    "&list_lastname=" + encodeURI( document.getElementById("list_lastname").value ) +
		    "&list_email_add=" + encodeURI( document.getElementById("list_email_add").value ) +
		    "&list_check=" + encodeURI( document.getElementById("list_check").value ) +
		    "&list_on_off=" + getCheckedValue(document.forms['list_myform'].elements['list_on_off']);
		    // uncomment for debugging
		    //alert(poststr);
      makePOSTRequest('newsletter_ajax.php', poststr);
   }