function check(select){
key = document.so.word.value;
switch(select){
case 100: window.open('http://www.baidu.com/s?tn=engfish_pg&ie=utf-8&wd=filetype:ppt+'+key);break;
case 101: window.open('http://www.baidu.com/s?tn=engfish_pg&ie=utf-8&wd=filetype:doc+'+key);break;
case 102: window.open('http://www.baidu.com/s?tn=engfish_pg&ie=utf-8&wd=filetype:pdf+'+key);break;
case 103: window.open('http://www.baidu.com/s?tn=engfish_pg&ie=utf-8&wd=filetype:all+'+key);break;
case 104: window.open('http://www.baidu.com/s?tn=engfish_pg&ie=utf-8&wd='+key);break;
case 105: window.open('http://baike.baidu.com/w?ct=17&lm=0&tn=baiduWikiSearch&pn=0&rn=10&ie=utf-8&word='+key);break;

case 110: window.open('http://www.google.cn/search?sa=%E6%90%9C%E7%B4%A2&client=pub-7142409741534559&forid=1&prog=aff&channel=9141922437&ie=UTF-8&oe=UTF-8&hl=zh-CN&q=filetype%3Appt+'+key);break;
case 111: window.open('http://www.google.cn/search?sa=%E6%90%9C%E7%B4%A2&client=pub-7142409741534559&forid=1&prog=aff&channel=9141922437&ie=UTF-8&oe=UTF-8&hl=zh-CN&q=filetype%3Adoc+'+key);break;
case 112: window.open('http://www.google.cn/search?sa=%E6%90%9C%E7%B4%A2&client=pub-7142409741534559&forid=1&prog=aff&channel=9141922437&ie=UTF-8&oe=UTF-8&hl=zh-CN&q=filetype%3Apdf+'+key);break;
case 113: window.open('http://www.google.cn/search?sa=%E6%90%9C%E7%B4%A2&client=pub-7142409741534559&forid=1&prog=aff&channel=9141922437&ie=UTF-8&oe=UTF-8&hl=zh-CN&q=filetype%3Aswf+'+key);break;
case 115: window.open('http://www.google.cn/search?sa=%E6%90%9C%E7%B4%A2&client=pub-7142409741534559&forid=1&prog=aff&channel=9141922437&ie=UTF-8&oe=UTF-8&hl=zh-CN&q='+key);break;

case 160: window.open('http://www.iciba.com/search?s='+key);break;
case 161: window.open('http://www.baidu.com/baidu?ie=UTF-8&ct=1048576&cl=3&word='+key);break;
case 163: window.open('http://dict.youdao.com/search?q='+key);break;
case 164: window.open('http://www.onelook.com/?ls=a&w='+key);break;

case 175: window.open('http://www.ldoceonline.com/search/?search_str='+key);break;
}
}