一个ajax的有关问题

一个ajax的问题
ajax.php

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title><script>    function GetXmlHttpObject()    {        var XMLHttp=null;        try        {            XMLHttp=new XMLHttpRequest();        }        catch(e)        {            try            {                XMLHttp=new ActiveXObject("Msxml2.XMLHTTP");            }            catch(e)            {                XMLHttp=new ActiveXObject("Microsoft.XMLHTTP");            }        }        return XMLHttp;    }            function submit_form(tag)    {        XMLHttp=GetXmlHttpObject();        var aurl="deal_ajax.php?tag="+tag+"&url="+document.getElementById("url").value+"";        XMLHttp.open("GET",aurl,true);        XMLHttp.send(null);        XMLHttp.onreadystatechange=function()        {            if(XMLHttp.readyState==4&&XMLHttp.status==200)            {                document.getElementById("status").innerHTML=XMLHttp.responseText;            }        }    }</script><div align="center" style="text-align:center">
<form action="" method="post"><table width="900" border="1">  <tr>    <td>url</td>    <td><input name="url" type="text" style="width:400px" id="url"></td>  </tr>  <tr>    <td>message</td>    <td><textarea name="message" cols="" rows="" id="message"></textarea></td>  </tr>  <tr>    <td><input name="save" type="submit" value="保存" id="save" onclick="submit_form('later')"></td>    <td><input name="fabu" type="submit" value="发布" id="fabu" onclick=""></td>  </tr>
</table></form>
<div id="status"></div>
</div>

deal_ajax.php

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?phpecho "#######@".$_REQUEST['url'];?>

点击“保存”按钮可以异步提交到deal_ajax.php，但是马上就走form的action了！！！！用post也是

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type="submit" 

改成
type="button"
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onclick="submit_form('later');return false"
------解决方案--------------------

PHP code

echo "<meta http-equiv="Content-Type" content="text/html; charset=utf-8">" .        "<script type="text/javascript" language="javascript">".        "if(confirm('ok')){" .        "    window.location.href='{$href}';" .        "} else{            history.back();        }" .        "</script>";        exit;<div class="clear">
                 
              
              
        
            </div>