function cks(){
var strurl;
var f = window.document.sf;
var u = f.elements[0];
var p = f.elements[1];
var a1 = f.elements[2];
if(f.word.value == "..查询关键字.." || f.word.value.length == 0)
{
  alert('请输入查询关键字！');
  f.word.focus();
  return false;
}
switch (f.s2.selectedIndex)
 {
 case 0:	//百度
  strurl = "http://www.baidu.com/baidu"
  break;
 case 1:	//google搜索
  u.name = "q"
  p.name = "ie"; p.value="GB2312"
  a1.name = "hl"; a1.value="zh-CN"
  strurl = "http://www.google.com/search"
  break;
 case 2:	//中国搜索
     u.name = "word"
  strurl = "http://page.zhongsou.com/zspage.cgi"
  break;
 case 3:	//搜狐搜索
  u.name = "query";
  strurl = "http://search.sohu.com/web"
  break;
 case 4:	//网易搜索
   u.name = "q"
   p.name = "c"; p.value="25"
  a1.name = "source"; a1.value="163"
  strurl = "http://site.so.163.com/search.php"
  break;
  case 5:	//新浪
  u.name = "_searchkey"
  p.name = "_andor"; p.value="and"
  a1.name = "_ss"; a1.value="sina"
  strurl = "http://search.sina.com.cn/cgi-bin/search/search.cgi?"
  break;
 case 6:	//tom搜索
  u.name = "word"
  p.name = "tomsearch"; p.value="webpage"
  a1.name = "f"; a1.value="8"
  strurl = "http://search.tom.com/search.php"
  break;
 case 7:	//中华网搜索
  u.name = "query"
   p.name = "confirm"; p.value="QW"
  strurl = "http://search.china.com/search/result.php?"
  break;
 case 8:	//一搜
  u.name = "p"
  strurl = "http://www.yisou.com/search"
  break;
 case 9:	//词霸搜索
  u.name = "s"
  p.name = "t"; p.value="word"
  a1.name = "lang"; a1.value="utf-8"
  strurl = "http://cb.kingsoft.com/search?"
  break;
 case 10:	//天中焦点
    u.name = "keyword"
   p.name = "strField"; p.value="Content"
  strurl = "http://news.tianzhong.net/Article/Search.asp"
  break;
  case 11:	//百度图片
      u.name = "word"
   p.name = "lm"; p.value="-1"
  a1.name = "ct"; a1.value="201326592"
  strurl = "http://image.baidu.com/i"
  break;
 case 12:	//天中供求
  u.name = "Keyword"
  p.name = "InfoClass"; p.value="0"
  strurl = "http://gq.tianzhong.net/Search_Info.asp"
  break;
  case 13:	//网址大全
  u.name = "keywords"
  p.name = "stype"; p.value="1"
  strurl = "http://www.tianzhong.net/wz/url_search.asp"
  break;
 case 14:	//天空软件
  u.name = "ss_name"
   p.name = "sor"; p.value="00"
  strurl = "http://www1.skycn.com/search.php"
  break;
 case 15:	//sogua
  u.name = "key"
    p.name = "search"; p.value="music"
  strurl = "http://search.sogua.com/search/search.asp"
  break;
 } 
  f.action=strurl;
//  f.submit()
  return true;
}
function Clearname(){
document.sf.s2.value="";
}