/*GetCookie(name) 获取Cookies方法 ，name为名字
SetCookie(name,value,interval,number,[path],[domain],[secure]) 设置cookies方法
name 名称，value cookies值，interval（"y" 年,"q"季,"m"月,"d"日,"h"时,"M"分,"s"秒，默认：日），number：数量级
[path],[domain],[secure] 可缺省。
DelCookie(name) 删除设置过期cookies ， name：cookies名称 
mr.junval@qq.com 2008
*/
function GetCookieVal(offset){
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
      endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie(name){
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen){
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
      return GetCookieVal (j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break;
  }
  return null;
}

function DelCookie(name){
  var exp = new Date();
  exp.setTime (exp.getTime() - 1);
  var cval = GetCookie (name);
  document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}

function SetCookie(name, value,interval,number){
  if (interval == "0") return false;
  var expdate = new Date();
  var argv = SetCookie.arguments;
  var argc = SetCookie.arguments.length;
  var expires = DateAdd(interval,number,expdate);
  var path = (argc > 4) ? argv[4] : null;
  var domain = (argc > 5) ? argv[5] : null;
  var secure = (argc > 6) ? argv[6] : false;
  document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : "");
}

function DateAdd(interval,number,date){
  switch(interval){
    case "y":{
      date.setFullYear(date.getFullYear()+number); 
      return date; 
      break; 
    }
   case "q":{
      date.setMonth(date.getMonth()+number*3); 
      return date; 
      break; 
    }
  case "m":{
      date.setMonth(date.getMonth()+number); 
      return date; 
      break; 
    }
  case "w":{
     date.setDate(date.getDate()+number*7); 
     return date; 
     break; 
    }
  case "d":{
    date.setDate(date.getDate()+number); 
    return date; 
    break; 
    }
  case "h":{
    date.setHours(date.getHours()+number); 
    return date; 
    break; 
    }
  case "M":{
    date.setMinutes(date.getMinutes()+number); 
    return date; 
    break; 
   }
  case "s":{
    date.setSeconds(date.getSeconds()+number); 
    return date; 
    break; 
   }
  case "0":{ 
    return date; 
    break; 
    }
  } 
}