麻烦大家看看我这代码。。。。隐藏的错误
<%@page contentType="text/html" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><link href="css\Style_135.css" rel="stylesheet" type="text/css" /><title>完全训练--诗意长廊</title><style>#gn{width:100%;height:30px;float:right;clear: both;text-align:right;padding-right:8px;padding-top:5px;background-color: #FFFFFF;filter:alpha(opacity=35);color:#000000;}#gn table { text-align:right;}#gn td { color:#000000;}#gn a{color:#000000;}</style></head><body topmargin=0 leftmargin=0><div id="menu" class='d'><TABLE><TR><TD><ul><li ><a href="shiyichanglang\01.html" target=list >欣赏作品一</a></li><li ><a href="03.html" target=list>欣赏作品二</a></li><li ><a href="05.html" target=list>欣赏作品三</a></li><li ><a href="06.html" target=list>欣赏作品四</a></li></ul></TD></TR></TABLE></div><TABLE><TR><TD><iframe frameBorder=0 marginHeight=0 marginWidth=0 scrolling=auto src=shiyichanglang\01.html width=800 height=550 name=list></iframe> </td> </tr></table><br><table width="100%" border="0" cellspacing="10" cellpadding="0"> <tr> <td width="20%" height="234"> </td> <td width="62%" align="left" valign="top"><form name="form1" onsubmit=createXMLHttpRequest()> <table width="100%" border="0" cellspacing="10" cellpadding="0"> <tr> <td width="8%">昵称:</td> <td colspan="2"><input name="user" type="text" id="user" size="30" maxlength="32"></td> <td width="37%"> </td> <td width="15%"> </td> </tr> <tr> <td height="53">密码:</td> <td colspan="2"><input name="password" type="password" id="password" size="30" maxlength="32"></td> <td>路人评论可不用密码 </td> <td> </td> </tr> <tr> <td height="38">验证码:</td> <td width="12%"><input name="yanzhengma" type="text" id="yanzhengma" size="10" maxlength="4" value=2011></td> <td width="28%"><img border=0 src="image"></td> <td> </td> <td> </td> </tr> <tr> <td valign="top">内容：</td> <td colspan="3"><textarea name="neirong" id="neirong" cols="50" rows="10"></textarea></td> <td> </td> </tr> <tr> <td height="26"> </td> <td><input type="submit" name="tijiao" id="tijiao" value="发表留言" ></td> <td><input type="button" name="quxiao" id="quxiao" value="取消"></td> <td> </td> <td> </td> </tr> </table> </form></td> <td width="18%"> </td> </tr></table><div id="pinglun"></div></body><script charSet="utf-8"> var httprequest,yanzhengma; function createXMLHttpRequest(){ alert("成功访问函数createXMLHttpRequest()"); if (window.XMLHttpRequest) { httprequest = new XMLHttpRequest(); } else if (window.ActiveXObject) { httprequest = new ActiveXObject("Microsoft.XMLHTTP"); } yanzhengma=document.getElementById("yanzhengma").vlaue url="dengruserver.do?username="+yanzhengma"; httprequest.open('GET', url, true); httprequest.onreadystatechange = OnStatusChange; httprequest.send(); } function OnStatusChange() { if (httprequest.readyState == 4) // 完全接受 { if (httprequest.status == 200) // 服务器已经成功响应 { alert("访问服务器成功"); document.getElementById('pinglun').innerHTML = httprequest.responseText; } else // 访问出错 { //alert(httprequest.responseText); alert("访问出错"); } } }</script></html>