function setCookie(name,value)
{
    var Days = 2;   
    var exp = new Date(); 
    exp.setTime(exp.getTime() + Days*24*60*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 unescape(arr[2]); 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();
}