function ajaxFileUpload()
    {
        $("#loading")
        .ajaxStart(function(){
            $(this).show();
        })
        .ajaxComplete(function(){
            $(this).hide();
        });
        $.ajaxFileUpload
        (
            {
                url:'upload.php?do=upload',
                secureuri:false,
                fileElementId:'fileToUpload',
                dataType: 'json',
                data:{name:'logan', id:'id'},
                success: function (data, status)
                {
                    if(typeof(data.error) != 'undefined')
                    {
                        if(data.error != '')
                        {
                            alert(data.error+'abc');
                        }else
                        {
                            document.getElementById('photo').value=data.msg;
                            var node1 = document.getElementById('imgnode1');
                            var text = 
                            "<br><img src='"+data.msg
                            +"' width='130' height='160' >"
                            +"<form name='imgdel' id='imgdel' action='upload.php?do=delete' method='post'>"
                            +"<input type='hidden' name='file' value='"+data.msg
                            +"'><input type='button' onclick='return ajaxFileDelete();' value='删除'></form>";
                            var node2 = document.getElementById('imgnode2');
                            [color=#FF0000]node2.innerHTML = text;[/color]
                        }
                    }
                },
                error: function (data, status, e)
                {
                    alert(e);
                }
            }
        )

        return false;
    }

            <tr><th align="right">照片</th><td></td>
            <td><input name="photo" id="photo" value="" type="hidden" />
            <div id="imgnode1">
            <input type="file" size=28 name="file" id="fileToUpload" class="input" /> 
            <br />
            <input type="button" id="buttonUpload" onclick="return ajaxFileUpload();" value="上传" />
            </div>
            <div id="imgnode2">&nbsp;</div>
            </td></tr>