function ReImgSize(){
  for (i=0;i<document.images.length;i++)
   {
   if (document.all){
      if (document.images[i].width>500)
      {
            document.images[i].width="500"
       try
       {
            document.images[i].outerHTML='<a href="'+document.images[i].src+'" target="_blank" title="在新窗口打开图片">'+document.images[i].outerHTML+'</a>'
       }catch(e){}
     }
   }
  else{
        if (document.images[i].width>300) {
          document.images[i].title="在新窗口打开图片"
          document.images[i].style.cursor="pointer"
          document.images[i].onclick=function(e){window.open(this.src)}
        }
  }
  }
}
ReImgSize();