function createRequestObject() {
     var ro;
     var browser = navigator.appName;
     if(browser == "Microsoft Internet Explorer"){
          ro = new ActiveXObject("Microsoft.XMLHTTP");
     }else{
          ro = new XMLHttpRequest();
     }
     return ro;
}

var http = createRequestObject();

function sndReq(action) {
     http.open('get', 'ajax_response.php?action='+action);
     http.onreadystatechange = handleResponse;
     http.send(null);
}

function handleResponse() {
     if(http.readyState == 4){
          var response = http.responseText;
          var update = new Array();

          if(response.indexOf('|') != -1) {
               update = response.split('|');
               document.getElementById(update[0]).innerHTML = update[1];
          }
     }
}