function _check_active(url){
    // no ie
    if (window.XMLHttpRequest) 
    {
        req1 = new XMLHttpRequest();
        req1.onreadystatechange = func2;
        req1.open("GET", url, true);
        req1.send(null);
    }
    // ie
    else if (window.ActiveXObject) 
    {
        req1 = new ActiveXObject("Microsoft.XMLHTTP");
        if (req1) 
        {
            req1.onreadystatechange = func2;
            req1.open("GET", url, true);
            req1.send();
		}
    }
}

function func2(){
    //if (req1.readyState == 4){
		//if (req1.status == 200){
			//document.getElementById('perepicka').innerHTML = req.responseText+document.getElementById('perepicka').innerHTML;
            //alert('user active at'+req1.responseText);
		//}
    //}
}