上传图片这个按钮在IE6、7上无法点击，IE8正常

上传功能的部分代码如下function getUpApi(obj) {
            uploadInit(obj, "../../sysaspx/upload.aspx", "jpg,jpeg,gif,png,doc,zip,rar,txt,swf,flv,mp3,avi,ram,rm,wma,wmv,pdf");
        }
 <tr>
                            <td align="center" height="30">
                                信息图片：
                            </td>
                            <td>
                                
                                <input name="BaseInfo_Image" type="text" style="width: 300px" id="BaseInfo_Image" class="xheText" />                                <script type="text/javascript">
                                    getUpApi($("#BaseInfo_Image"));
                                </script>                            </td>
                        </tr>