function getCookie(name)
{
	var dc = document.cookie;
	var prefix = name+"=";
	var begin = dc.indexOf("; "+prefix);
	if(begin == -1)
	{
		begin = dc.indexOf(prefix);
		if(begin != 0)
			return "";
	}
	else
	{
		begin+= 2;
	}
	var end = dc.indexOf(";", begin);
	if(end == -1)
		end = dc.length;
	return unescape(dc.substring(begin + prefix.length, end));
}
function setCookie(name,value)
{
	var argv = setCookie.arguments;
	var argc = setCookie.arguments.length;
	var expires = (argc > 2) ? argv[2] : null;
	var path = (argc > 3) ? argv[3] : null;
	var domain = (argc > 4) ? argv[4] : null;
	var secure = (argc > 5) ? argv[5] : false;

	if(expires == null) expires = 30*24*60*60; //ĬÈϱ£´æ30Ìì

	var expdate = new Date();
	expdate.setTime(expdate.getTime() + (expires * 1000));
	document.cookie = name + "=" + escape(value) + ((expires == null) ? "" : ("; expires=" + expdate.toGMTString())) 
+ ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) 
+ ((secure == true) ? "; secure" : "");
}
function delCookie(name)
{
	var expdate = new Date();
	expdate.setTime(expdate.getTime() - 1);
	document.cookie = name + "=; expires=" + expdate.toGMTString();
}