/**
 * 功能：寫cookie
 */
function setCookie(name,value) 
{
    var Days = 90; 
    var exp = new Date(); 
    exp.setTime(exp.getTime() + Days*24*60*60*1000); 
    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString(); 
} 

/**
*讀取cookie
 */
function getCookie(name) 
{ 
    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
 
    if(arr=document.cookie.match(reg))
 
        return unescape(arr[2]); 
    else 
        return null; 
}
 

/**
 * 刪除cookie
 */
function delCookie(name)
{
	var exp = new Date();
	exp.setTime(exp.getTime() - 1);
	var cval=getCookie(name);
	if(cval!=null)
	document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}