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<form     name="form1">  
  <input type="file"     name="file1"     onchange="checkimage
(value)">  
  </form>  
  <script     language="javascript">  
  var     img=null;  
  function     checkimage(name){  
  if(/^.+\.(gif|jpg|png)$/i.test(name))  
  {  
  if(img)img.removeNode(true);  
  img=document.createElement("img");  
  img.style.position="absolute";  
  img.style.visibility="hidden";  
  img.attachEvent("onerror",oe);  
  img.attachEvent("onreadystatechange",orsc);  
  document.body.insertAdjacentElement("beforeend",img);  
  img.src=name;  
  }  
  else{oe()}  
  }  
  function     oe(){  
  form1.reset();  
  alert("ÎļþÀàÐÍÖ»ÄÜÊÇ<gif><jpg><png>!");  
  }  
  function     orsc(){  
  if     (img.fileSize>51200){  
  form1.reset();  
  alert("Îļþ´óС²»Äܳ¬¹ý50K!");  
  }  
  }  
  </script>


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