用webborwser打开一个搜索网页后，如何实现搜素？真心求教！！

我用webborwser打开一个搜索网页后,我用WebBrowser1.Document.getElementById("query").Value = "xxxx"实现了向搜索框里输入文字的功能,那么如何实现自动搜索功能呢？ 网页源码如下 ：：：
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method="post"> <div class="field"> <label>账号:</label> <input type="text" maxlength="32" class="username ipt" name="username"/> </div> <div class="field"> <label>邮箱:</label> <select class="mail" name="mail" id="mail"> <option>--请选择邮箱--</option> </select> </div> <div class="field"> <label>密码:</label> <input type="password" maxlength="32" class="passwd ipt" name="passwd"/> <button type="submit" class="btn">登 录</button> </div> </form> </div> <div class="ad-box log-position" data-position="banner" id="J_img-ad"> <a href="http://antamt.tmall.com/shop/viewShop.htm?prc=1" title='安踏美淘专卖店'><img src="http://img01.taobaocdn.com/tps/i1/T1jbGXXb0yXXXXXXXX-356-73.jpg" alt='安踏美淘专卖店'/></a> </div> <div class="time-box"> <div class="city"> <span id="J_timezone_city_wrap"><span id="J_timezone_city">北京</span></span> <a href="#" class="grey" id="J_timezone">更换时区</a> <a href="#" id="J_clock" class="clock">[闹钟提醒]</a> </div> <div class="now clearfix"> <div data-server-time="1304569775000" class="clock-container" id="clock_container"> 12<span class="dot">:</span>29<span class="seconds">35</span> </div> <div class="wrapper"> <p><span id="gl">2011年05月05日</span></p> <p><span id="nl">四月初三</span>  <span id="weekday">周四</span></p> </div> </div> </div> </div> </div> <!-- header end --> <div class="menu-bar"> <ul id="J_search-menu" class="search-menu"> <li data-menu="page" class="sm current"><a target="_self" href="#">网 页</a><b></b></li> <li data-menu="music" class="sm"><a target="_self" href="#">MP3</a><b></b></li> <li data-menu="video" class="sm"><a target="_self" href="#">视 频</a><b></b></li> <li data-menu="image" class="sm"><a target="_self" href="#">图 片</a><b></b></li> <li data-menu="map" class="sm"><a target="_self" href="#">地 图</a><b></b></li> <li data-menu="news" class="sm"><a target="_self" href="#">新 闻</a><b></b></li> <li data-menu="more" id="J_menu-more" class="menu-more-href sm"><a class="more" target="_self" href="#">更 多</a> <ul id="J_menu-more-item" class="menu-more hide"> <li><a href="http://pinyin.sogou.com/">输入法</a></li> <li><a href="http://ie.sogou.com/">浏览器</a></li> </ul> </li> </ul> <div class="menu-msg" id="keywords"><a href="http://bangpai.taobao.com/group/thread/824784-256640325.htm" style="color:#178517;" >周公解梦上线啦 点此解梦 »</a></div> </div> <div class="search-box"> <div id="tbsearch-options" class="hide"> <div class="sogou"> <span class="site page"></span> </div> <div class="baidu"> <span class="site page"></span> </div> <div class="google"> <span class="site page"></span> </div> </div> <form target="_self" action="http://www.sogou.com/sogou" id="gsearchform" method="get" class="sogou"> <input type="hidden" value="AQqDA" name="pid" id="clientNameSogou"><input name="ie" value="gbk" type="hidden"/> <span class="site page"><span class="down-arrow"></span></span> <input type="text" maxlength="200" id="gkeyword" class="keyword ipt" name="query" /> <button type="submit" class="btn">搜 索</button> <span id="news-keyword" class="log-position" data-position="newskey"></span><input type="hidden" id="J_search-type" value="page"/> </form> <script>document.getElementById('gkeyword').focus();</script> <form target="_self" action="http://s.taobao.com/search" method="get" id="taosearchform" onsubmit="setDisplay('suggests', 0);"> <a href="http://www.taobao.com/" class="site taobao"></a> <input type="text" maxlength="200" id="tkeyword" class="keyword ipt" name="q"/> <button type="submit" class="btn">搜 索</button> <span id="hot-keyword" class="log-position" data-position="taobaokey"> <a href="http://s.taobao.com/search?q=%C1%AC%D2%C2%C8%B9">连衣裙</a> <a href="http://s.taobao.com/search?q=T%D0%F4">T恤</a> <a href="http://dianpu.tao123.com/nvbao/?pid=mm_14082281_0_0">女包</a> <a href="http://s.taobao.com/search?q=%CB%BF%CD%E0">丝袜</a> <a href="http://www.taobao.com/go/act/sale/mothers_day.php" class="notify">感恩母爱</a> <a href="http://s.taobao.com/search?q=%C1%B9%D0%AC">凉鞋</a> <a href="http://top.taobao.com/?Tao123" class="more">更多 »</a> </span> </form> </div> <div id="content" class="layout grid-s228m0"> <div class="col-main"> <div class="main-wrap"> <div class="main clearfix" id="J_main-tab"> <div class="quick-search"> <input value="请输入网站名或拼音" id="J_quick-search" type="text" class="ipt hint" maxlength="32"/> <s></s> </div> <ul class="menu"> <li class="current"><h3>名站导航</h3></li> <li><h3>我的导航</h3></li> <li><h3>常用软件</h3></li> <li><h3>股票基金</h3></li> <li><h3>彩票开奖</h3></li> <li><h3>热门游戏</h3></li> <li><h3>生活助手</h3></li> </ul> <div class="content"> <div class="navigation log-position" data-position="navi"> <table> <tbody> <tr> <td><a href="http://www.baidu.com/" data-siteid="1000066">百度</a>•<a href="http://tieba.baidu.com/">贴吧</a></td> <td><a href="http://www.sina.com.cn/" data-siteid="1000067">新浪</a>•<a href="http://weibo.com/?c=spr_sw_sq_lm1_weibo_p001316">微博</a></td> <td><a href="http://www.sohu.com/" data-siteid="1000068">搜狐</a>•<a href="http://sports.sohu.com/">体育</a></td> <td><a href="http://www.163.com/" 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