function sendAjax(url, parameters, responseObject) {
   
      var 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('There was a problem communicating with the server.');
         return false;
      }
      
      http_request.onreadystatechange = function(){
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            result = http_request.responseText;
                 responseObject.innerHTML = result;    
         } else {
            //alert('There was a problem communicating with the server.');
         }
      }      	
		
	};
      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);
   }