//存入cookie

function setCookie(name,value){

  var Days = 30;

  var exp = new Date();

  exp.setTime(exp.getTime() + Days*24*60*60*1000);

  document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();

}

//获取cookie

function getCookie(name){

  var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");

  if(arr=document.cookie.match(reg))

  return unescape(arr[2]);

  else

 return null;

}