//?????????
  function check(url){
    var Img=new Image();
    var txtfile=document.all("txtfile");
    Img.onload = function(){if(this.width>500 || this.height>400){alert('????????');txtfile.outerHTML=txtfile.outerHTML;}else{document.all('browPic').src=txtfile.value;}}
    Img.onerror = function(){alert('???????????????');txtfile.outerHTML=txtfile.outerHTML;}
    Img.src = url;
}