firefox控制台中显示一个框架文档的字符编码未声明。该文档可能与非框架时的显示效果不同，怎么修改呢

"http://www.var myImages ={length:4,0:'style/style.css',1:'style/basic.css',2:'image/navbar.png',3:'image/slideshow.gif'};
var qtool = {};
function loadImages(){
var isIE=/*@cc_on!@*/0,
  //isFF = !!document.getBoxObjectFor || 'mozInnerScreenX' in window,
  isOP = !!window.opera && !!window.opera.toString().indexOf('Opera'),
  res = Array.prototype.slice.call(myImages);

 if(isIE||isOP)

 {
  qtool.preload = (function(){
   window["preimgs"] = {};
   var seri=1;
   return function(){
    var res=Array.prototype.slice.call(myImages),
    i=res.length;
    while(i--)
    {
     var img = window["preimgs"][i] = new Image();
     img.onload = img.onerror = function() {window["preimgs"][this.serial]=null;delete window["preimgs"][this.serial];};
     img.src = res[i];
     img.serial = seri++;
    }  

   };
  })();

 }

 /*else if(isFF)

 {

 }*/

 else

 {
  qtool.preload = function()
  {
   var res = Array.prototype.slice.call(myImages),
    i=res.length;
   if(document&&document.body)
   {
    while(i--)
    {
     var obj = document.createElement('object');
     obj.data = res[i];
     obj.width  = obj.height = 0;
     obj.onload = function() {obj.style.display="none";};
     obj.onerror = function() {obj.style.display="none";};
     document.body.appendChild(obj);
    }
   }
  }

 }

 //TODO 支持HTML草案的Link Prefetch
//http://www.
qtool.preload.apply(qtool,res);
}

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