php结合jquery异步上传图片（ajaxSubmit）

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php结合jquery异步上传图片（ajaxSubmit），以下为提交页面代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Ajax异步上传图片</title>
<script src="js/jquery-1.4.2.js" language="JavaScript" type="text/javascript"></script>
<script src="js/jquery.form.js" language="JavaScript" type="text/javascript"></script>
<script type="text/javascript">function sky_upfiles(){var messtxt;$("#sky_upform").ajaxSubmit({//dataType:'script',
                                type:'post',url: "doupfiles.php",    beforeSubmit: function(){$("#sky_txt").html("图片上传中...");},success: function(data){        if(data=="1"){messtxt = "上传成功！";}else if(data=="-1"){messtxt = "文件超过规定大小！";}else if(data=="-2"){messtxt = "文件类型不符!";}else if(data=="-3"){messtxt = "移动文件出错!";}else{messtxt = "未知错误!";}$("#sky_txt").html(messtxt);                //$("#sky_txt").append(data);
                                },resetForm: false,clearForm: false});//$("#upimgform").submit();
}</script>
</head>
<body>
<br />
<fieldset style="width:97%"><legend>上传文件</legend><form enctype="multipart/form-data" id="sky_upform" name="sky_upform" action="" method="post"><table width="100%" border="0" align="center" cellpadding="3" cellspacing="0"><tr><td width="100" align="right" class="f-12"></td><td class="f-12" align="left"><input name="upfile" id="upfile" maxlength="20" size="40" type="file" value="" /><input name="upmit" type="button" id="upmit" value="上传" onclick="sky_upfiles()"/><font color="red" id="sky_txt"></font></td></tr>       </form></body>
</html>