var img = null;
    function OnUpload() {
        //var id = parent.document.getElementById("baEntity.id").value;
        var id = parent.key;
        if (id == -1) {
            alert("请先录入步骤一");
            return false;
        } else {
            if (img)
                img.removeNode(true);
            img=document.createElement("img"); 
            img.style.position = "absolute";
            img.style.visibility = "hidden";
            img.attachEvent("onreadystatechange",OnStateChange); 
            img.attachEvent("onerror",OnError);
            document.body.insertAdjacentElement("beforeend", img);
            img.src = $("#txtFile").val();
            
        }
    }
    function OnError() {
        alert("支持JPG,PNG,GIF,BMP,JPEG格式的图片上传!");
    }
    function OnStateChange(){
    alert("dsdsd");
        if (img.readyState != "complete")
            return false;
        if (CheckValidate()) {
            if (img.fileSize < 5242880) {
                document.forms[0].action = "FileUpload.do?uploadtype=1"+"&picturetype="+picturetype;
                document.forms[0].submit();
            } else {
                alert("图片大小不能超过5M!");
                return false;
            }
        }
    }
    function CheckValidate() {
        var dirUrl = document.getElementById("txtFile").value;
        if (dirUrl == null || dirUrl == "") {
            alert('文件路径不能为空!');
            return false;
        } else
            return IsValidateFile(dirUrl);
    }