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<script type="text/javascript">
var xmlHttp;
function createXmlHttp(){
if(window.ActiveXObject){
return new ActiveXObject("Microsoft.XMLHTTP");
}
if(window.XMLHttpRequest){
return new XMLHttpRequest();
}
}

function upLoad(id){
document.getElementById("file"+id).select();
var fileName=document.selection.createRange().text
    var lens=fileName.length;
    if(lens==0){
    return;
    }
    var extname=fileName.substring(lens-4,lens);
    if(extname!=".jpg"&&extname!=".JPG"){
    alert("ÇëÑ¡ÔñjpgÎļþ!");
    document.getElementById(id).innerHTML=" <input id='file"+id+"' type='file' size='3' onchange='upLoad(\""+id+"\")'/>";
  return ;
}
var folds = document.getElementById("folds"+id).value;
xmlHttp=createXmlHttp();
xmlHttp.onreadystatechange=han