function setCookie(name,value,Days)
{
 var exp = new Date(); //new Date("December 31, 9998");
 exp.setTime(exp.getTime() + Days*1*60*60*1000);
 document.cookie = name + "="+ escape (value) + ";path=/;expires=" + exp.toGMTString();
}

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