var nowURL = document.location.search;
var dateObj = new Date();
var sysMonth = dateObj.getMonth();

var monthName = ["january",
                 "february",
                 "march",
                 "april",
                 "may",
                 "june",
                 "july",
                 "august",
                 "september",
                 "october",
                 "november",
                 "december"
                ];
var monthImg = new Array();
monthImg[monthName[0]] = ["../tips/month1_on.gif" , "../tips/month1_off.gif"];
monthImg[monthName[1]] = ["../tips/month2_on.gif" , "../tips/month2_off.gif"];
monthImg[monthName[2]] = ["../tips/month3_on.gif" , "../tips/month3_off.gif"];
monthImg[monthName[3]] = ["../tips/month4_on.gif" , "../tips/month4_off.gif"];
monthImg[monthName[4]] = ["../tips/month5_on.gif" , "../tips/month5_off.gif"];
monthImg[monthName[5]] = ["../tips/month6_on.gif" , "../tips/month6_off.gif"];
monthImg[monthName[6]] = ["../tips/month7_on.gif" , "../tips/month7_off.gif"];
monthImg[monthName[7]] = ["../tips/month8_on.gif" , "../tips/month8_off.gif"];
monthImg[monthName[8]] = ["../tips/month9_on.gif" , "../tips/month9_off.gif"];
monthImg[monthName[9]] = ["../tips/month10_on.gif" , "../tips/month10_off.gif"];
monthImg[monthName[10]] = ["../tips/month11_on.gif" , "../tips/month11_off.gif"];
monthImg[monthName[11]] = ["../tips/month12_on.gif" , "../tips/month12_off.gif"];

var cutID = ["eve_sairei",
             "eve_hanabi",
             "eve_marason",
             "eve_festa"
            ];
var cutImg = new Array();
cutImg[cutID[0]] = ["../tips/sairei_on.gif" , "../tips/sairei_off.gif"];
cutImg[cutID[1]] = ["../tips/hanabi_on.gif" , "../tips/hanabi_off.gif"];
cutImg[cutID[2]] = ["../tips/marason_on.gif" , "../tips/marason_off.gif"];
cutImg[cutID[3]] = ["../tips/festa_on.gif" , "../tips/festa_off.gif"];

function ChangeImg(targetId){
  if(nowURL.indexOf("aid=a01",0) >= 0){
    if(nowURL.indexOf("m=",0) >= 0){
      localTemp = nowURL.split("?");
      localWrk  = localTemp[1].split("&");
      monthNum = localWrk[1].replace(/m=/,"");
      monthNum = eval(monthNum)-1;
      document.getElementById(monthName[monthNum]).src = monthImg[monthName[monthNum]][0];
    }else{
      document.getElementById(monthName[sysMonth]).src = monthImg[monthName[sysMonth]][0];
    }
  }
  if(nowURL.indexOf("aid=sairei",0) >= 0 || nowURL.indexOf("aid=hanabi",0) >= 0 || nowURL.indexOf("aid=marason",0) >= 0 || nowURL.indexOf("aid=festa",0) >= 0){
    localTemp = nowURL.split("?");
    localWrk  = localTemp[1].split("&");
    localId   = "eve_" + localWrk[0].replace(/aid=/,"");
    document.getElementById(localId).src = cutImg[localId][0];
  }
}