var timer;
function hogehoge(){
    timer = setTimeout(piyopiyo, 5000);
    var scriptB = document.createElement("script");
    scriptB.src = "b.js?" + Math.random();
    var head = document.getElementsByTagName("head")[0];
    head.appendChild(scriptB);
}
function piyopiyo(){
    alert("disconnect");
}
function fugafuga(){
    clearTimeout(timer);
    alert("connect");
}