function setgw(newgw, btnimgname, btn_hl, btnObj, mycookie)
    {
         gwbtn.src = gwbtnfile;
         btnObj.src = btn_hl;
         gwbtn = btnObj;
         gwbtnfile = btnimgname;
         gw.style.display = "none";
         newgw.style.display = "block";
         gw = newgw;
         cookie_date = new Date();
         cookie_date.setDate(cookie_date.getDate() + 90);
         document.cookie = "gw=" + mycookie  + ";expires=" + cookie_date.toGMTString() + ";path=/cityu/;domain=www.cityu.edu.hk";
         document.cookie = "gw=" + mycookie  + ";expires=" + cookie_date.toGMTString() + ";path=/;domain=www.cityu.edu.hk";
         document.cookie = "gw=" + mycookie  + ";expires=" + cookie_date.toGMTString() + ";path=;domain=www.cityu.edu.hk";
    }

    function switchimage (btnimgname, btnObj)
    {
        if (btnObj != gwbtn){
            btnObj.src = btnimgname;
        }
        
    }
    

	initCookie();