//**************JavaScript的Cookies函数库************************
//参数：名称，值，天数，路径，domain，是否保密传送
function setCookie(name, value, expires, path, domain, secure){
	var strCookie = name + "=" + value;
	if (expires){
		var dtmNow = new Date();
		dtmNow.setTime(dtmNow.getTime() + expires*24*60*60*1000);
		strCookie += "; expires=" + dtmNow.toGMTString();
	}
	strCookie +=  (path) ? "; path=" + path : "";
	strCookie +=  (domain) ? "; domain=" + domain : "";
	strCookie +=  (secure) ? "; secure" : "";
	top.document.cookie = strCookie;
}
// 使用名称参数取得Cookie值, null表示Cookie不存在
function getCookie(name){	
	var strCookies = document.cookie;
	var cookieName = name + "=";
	var intBegin, intEnd, strValue;
	intBegin = strCookies.indexOf(cookieName);
	if (intBegin == -1) return null;
	intEnd = strCookies.indexOf(";", intBegin);
	if (intEnd == -1) intEnd = strCookies.length;  // 最後一个Cookie
	strValue = strCookies.substring(intBegin+cookieName.length,intEnd);
	return strValue;
}
// 删除Cookie,设置Cookie的期限为己过期
function deleteCookie(name, path, domain){
	var strCookie;
	if (getCookie(name)){
		strCookie = name + "="; 
		strCookie += (path) ? "; path=" + path : "";
		strCookie += (domain) ? "; domain=" + domain : "";
		strCookie += "; expires=Thu, 01-Jan-70 00:00:01 GMT";
		top.document.cookie = strCookie;
	}
}


function checklogin(){
if (formlogin.username.value==""){
alert("帐号不能为空");
formlogin.username.focus();
return false;
}
if (formlogin.password.value==""){
alert("密码不能为空");
formlogin.password.focus();
return false;
}
return true;
}
//*******************************************

var loginuser;
loginuser=getCookie("username");