//*****************************************
// FunctionName : switchImage
// Filename : switchimg3.js
// Copyright (c) VERSION510. ALL RIGHTS RESERVED.
//*****************************************
// 070115 Modified
// 061021 Modified
//*****************************************

var Obj=document.getElementById('switchimg'); 

function setClickEvent(){
  if(Obj.attachEvent){
    var e = Obj.attachEvent('onclick',runSwitchImage);
    return e;
  }else if(Obj.addEventListener){
    Obj.addEventListener('click',runSwitchImage,false);
    return true;
  }else{
    return false;
  }
}

function switchImage(rootPass,imgNum,imgFormat) {
  var idNum = Math.floor((imgNum + 1) * Math.random()); // randam number
  var filePass = rootPass + idNum + '.' + imgFormat; // image pass

  Obj.style.backgroundImage = 'url(' + filePass + ')'; // switch background image
}

function runSwitchImage(){
  switchImage('http://version510.com/common/switchimg/',10,'jpg');
}

// run
setClickEvent();
switchImage('http://version510.com/common/switchimg/',10,'jpg');