setcookie,getcookie,delcookie,setpostBgPic

function setCookie(name,value)
{
    var Days = 365; //此 cookie 将被保存 30 天
    var exp  = new Date();    //new Date("December 31, 9998");
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ escape (value) + ";path=/;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+";path=/;expires="+exp.toGMTString();
}
function setPostBgPic(getDefaultBg){
 var getValue=getCookie("mfl_templetPostBg");
 if(getValue=="null"||getValue==null||getValue==""){
  document.body.background=getDefaultBg;
 }else{
  document.body.background=getValue;
 }
}