// referrer
if (document.referrer) {
	var ref_url = GetCookie("ref_url");
	if (!ref_url) {
		ref_url = document.referrer;
		if (ref_url.indexOf(location.hostname) == -1) {
			SetCookie("ref_url", ref_url, 0, "/");
		}
	}
}

function _chgimg(imgName,imgUrl){ document.images[imgName].src = imgUrl; }
function MM_openBrWindow(theURL,winName,features) { //v2.0
	var win=window.open(theURL,winName,features);
	win.focus();
}

// cookie functions
// JavaScript & DHTMLクックブックより
function getExpDate(days, hours, minutes) {
	var expDate = new Date();
	if (typeof days == "number" && typeof hours == "number" && typeof minutes == "number") {
		expDate.setDate(expDate.getDate() + parseInt(days));
		expDate.setHours(expDate.getHours() + parseInt(hours));
		expDate.setMinutes(expDate.getMinutes() + parseInt(minutes));
	}
	return expDate.toGMTString();
}
function getCookieVal (offset) {
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1) { endstr = document.cookie.length; }
	return unescape(document.cookie.substring(offset, endstr));
}
function GetCookie (name) {
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;
	while (i < clen) {
		var j = i + alen;
		if (document.cookie.substring(i, j) == arg) {
			return getCookieVal (j);
		}
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break; 
	}
	return "";
}
function SetCookie (name, value, expires, path, domain, secure) {
  document.cookie = name + "=" + escape (value) +
    ((expires) ? "; expires=" + expires : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}
function DeleteCookie (name, path, domain) {
	if (GetCookie(name)) {
		document.cookie = name + "=" +
		((path) ? "; path=" + path : "") +
		((domain) ? "; domain=" + domain : "") +
		"; expires=Thu, 01-Jan-70 00:00:01 GMT";
	}
}