// JavaScript Document
//上面这个函数中的参数存有 cookie 的名称、值以及过期天数。
function setCookie(c_name,value,expiredays)
{
	/*
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+	((expiredays==null) ? "":";expires="+exdate.toGMTString());
	*/
	if(!navigator.cookieEnabled){
  		alert('不Cookie项!');
 	}else{
		var date=new Date();
		date.setTime(date.getTime()+60000*10);
		//document.cookie='userName='+escape(document.form1.userName.value)+';expires='+date.toGMTString()+';path=/'+';domaim=zgdsc.cn'+':secure';
		document.cookie=c_name+ "=" +escape(value)+	((expiredays==null) ? "":";expires="+date.toGMTString());
 	} 
}

function getCookie(c_name)
{
	if (document.cookie.length>0)
	{
		c_start=document.cookie.indexOf(c_name + "=");
		if (c_start!=-1)
		{ 
			c_start=c_start + c_name.length+1; 
			c_end=document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end=document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		} 
	}
	return "";
}

function checkCookie()
{
	username=getCookie('username');
	if (username!=null && username!="")
	{
		alert('Welcome again '+username+'!');
	}
	else 
	{
		username=prompt('Please enter your name:',"");
		if (username!=null && username!="")
		{
			setCookie('username',username,365);
		}
	}
}