function setCookie(name,value)
{
    var Days = 30;
    var exp = new Date();
    exp.setTime(exp.getTime() + Days*24*60*60*1000);
    document.cookie = name + "="+ encodeURIComponent (value) + ";expires=" + exp.toGMTString();

    
//    var strsec = getsec(time);
//    var exp = new Date();
//    exp.setTime(exp.getTime() + strsec*1);
//    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}

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

function readCookie(name)
{
    var start = document.cookie.indexOf( name + "=" ); 
    var len = start + name.length + 1;     
    if ( ( !start ) && ( name != document.cookie.substring( 0, name.length ) ) ) 
    {         
         return null;     
    }     
    if ( start == -1 )
          return null;     
   var end = document.cookie.indexOf( ';', len );     
   if ( end == -1 ) 
     end = document.cookie.length;
   return decodeURI(document.cookie.substring(len,end)); 
}

//删除cookies
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();
}

function getsec(str)
{
   alert(str);
   var str1=str.substring(1,str.length)*1;
   var str2=str.substring(0,1);
   if (str2=="s")
   {
        return str1*1000;
   }
   else if (str2=="h")
   {
       return str1*60*60*1000;
   }
   else if (str2=="d")
   {
       return str1*24*60*60*1000;
   }
}