子页面向父页传值，找不到此函数

父页面images.html
<HTML><HEAD><TITLE>插入图片</TITLE>
<META content="text/html; charset=utf-8" http-equiv=Content-Type>
<link rel="stylesheet" type="text/css" href="style/defaultEditor.css">
<script language="JavaScript">
function LoadIMG(imgpath){
                    window.dialogArguments.createLink2(imgpath);
window.close();
}
</script>
</Head>
<BODY>
<table cellpadding="5" cellspacing="0" width="400" height="200" border="0" align="center" id="tabDialogSize">
    <form name="form1" id="form1" method="post" action="upload.jsp" enctype="multipart/form-data" >
  <tr>
    <td height="20" align="left">本地上传</td>
        <td><input type="file" name="file1" id="file1" style="width:235px; border:#7E9DB9 1px solid"></td>
  </tr>
  <tr>
    <td><INPUT type='submit' value='确定添加' name='submit'></td>
    <td><INPUT type='button' value='按钮' name='sub' onclick="LoadIMG()"></td>
  </tr>
</form>
</table>
子页面upload.jsp
largepic="/img/201004/1270130569203.jpg";
<script>window.parent.LoadIMG('<%=largepic%>');</script>
在火狐下用FIREDEGUR调试的时候运行到upload.jsp上面这句的时候提示如下
错误信息是
window.parent.LoadIMG is not a function