function display(str){
    document.getElementById(str).style.display="block";
}
function no_display(str){
    document.getElementById(str).style.display="none";
}



function load_gallery(i){
    var nome=document.getElementById("gallery"+i).title;
    document.getElementById("gallery"+i).src="../webpages/galleria.php?id="+nome;
    document.getElementById("gallery"+i).style.display="block";
}

function show_ad(){
    document.getElementById("ad").style.display="block";
}

function hide_ad(){
    document.getElementById("ad").style.display="none";
}

function req(){
    var ajaxRequest;
    try{
        // Opera 8.0+, Firefox, Safari
        ajaxRequest = new XMLHttpRequest();
    } catch (e){
        // Internet Explorer Browsers
        try{
            ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try{
                ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e){
                alert("Errore");
                return false;
            }
        }
    }
    return ajaxRequest;
}

function registra(x,y){
    var ajaxRequest=req();
    ajaxRequest.onreadystatechange = function(){
        if(ajaxRequest.readyState == 4){
            var risposta = ajaxRequest.responseText;
        }    
    }
    ajaxRequest.open('POST', '../background/registra.php',true);
    params="x="+x+"&y="+y;
    ajaxRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    ajaxRequest.setRequestHeader("Content-length", params.length);
    ajaxRequest.setRequestHeader("Connection", "close");
    ajaxRequest.send(params);
}