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(file, user) {   

    http.open('get', 'file_download.php?cata='+file+ '&user='+ user);   
    /*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];   
        }   
    }   
}