expireDate = new Date;
	HasExpiredDate = new Date;
	expireDate.setMonth(expireDate.getMonth()+6)
	HasExpiredDate.setMonth(expireDate.getMonth()-6)
	
	UserID = 0;
	function setCookie() {
		document.cookie = "UserID ="+UserID +";expires=" + expireDate.toGMTString()

	}

	function deleteCookie() {
		UserID=-99;
		document.cookie = "UserID=0;expires=" + HasExpiredDate.toGMTString();
	}