var req;
 
function loadXMLDoc(url)
{
    req = null;
    if (window.XMLHttpRequest) {
        try {
            req = new XMLHttpRequest();
        } catch (e){}
    } else if (window.ActiveXObject) {
        try {
            req = new ActiveXObject('Msxml2.XMLHTTP');
        } catch (e){
            try {
                req = new ActiveXObject('Microsoft.XMLHTTP');
            } catch (e){}
        }
    }
 
    if (req) {       
        req.open("GET", url, true);
        req.onreadystatechange = processReqChange;
        req.send(null);
    }
}

function processReqChange()
{
  try { 
    if (req.readyState == 4) {
		u_comments.innerHTML=req.responseText;
        if (req.status == 200) {

        } else {
            alert("Не удалось получить данные:\n" +
                req.statusText);
        }
    }
  }
  catch( e ) {
  }
}