function Search()
{
 var keyword=document.all.keyword.value;
 var strsite=document.all.select4.value;
 var gourl="";
 switch (strsite) {
 case "google-c":
      gourl="http://www.google.com/search?hl=zh-CN&ie=UTF-8&lr=lang_zh-CN&q=";
      keyword = encodeURIComponent(keyword);
      break;
 case "baidu":
      gourl="http://www1.baidu.com/baidu?tn=site5566&word=";
      break;
 case "sina":
      gourl="http://search.sina.com.cn/?c=news&q=";
      break;
 case "sohu":
      gourl="http://www.sogou.com/sohu?query=";
      break;
 case "163":
      gourl="http://www.youdao.com/search?q=";
      break;
 case "yahoo":
      gourl="http://www.yahoo.com.cn/search?p=";
      break;
case "pku":
      gourl="http://bingle.pku.edu.cn/cgi-bin/search?FType=255&word=";
      break;
case "sinobnet":
      gourl="http://www.search.sinobnet.com/cgi-bin/hc/hcsitev3.cgi?word=";
      break;
 }
 if (gourl=="")
 { return false;}
 gourl+= keyword;
 window.open(gourl);
}