function SetCookie(name,value)
{
    var exp  = new Date(); 
    exp.setTime(exp.getTime() + 30*60*1000);
    document.cookie = name + "="+ escape(value) + ";expires=" + exp.toGMTString();
}
function getCookie(name)
{
    var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
    if(arr==null) return "7";
    var ck=unescape(arr[2]);
    if((ck.charAt(0)<'0')||(ck.charAt(0)>'6')) return "7";
    return ck;
}