window.onload = function() {
//読み込み時間の取得
indate=new Date();
//時間に変換
intime=indate.getTime();
//クエリパラメータの取得
qry=location.search;
//リファラーの取得
ref=document.referrer;
}

window.onunload = function() {
//終了時間の取得
outdate   = new Date();
//時間に変換
outtime   = outdate.getTime();
//滞在時間(秒)計算
time=Math.floor((outtime-intime)/1000);
if(qry.length>0){
	qry=qry.substring(1);
}else{
	qry='b=' +location.href;
}
//クエリパラメータのセット
qry=qry+"&s="+time + "&r=" + escape(ref);
if(window.XMLHttpRequest){
	httpObj = new XMLHttpRequest();
}else{
	httpObj = new ActiveXObject("Microsoft.XMLHTTP");
}
httpObj.open('POST','access_log.php',true);
httpObj.setRequestHeader("Content-Type" , "application/x-www-form-urlencoded");
httpObj.send(qry);
}