function search_start(){
eu=encodeURI(document.search_f.q.value);
if(document.search_f.vs[0].checked == true){
window.open('http://manboo.jword.jp/search?q='+eu+'&fr=yssw&ienc=UTF-8', '', '');
}else{
window.open('http://search.yahoo.co.jp/search?vs=manboo.co.jp&p='+eu+'&as_sitesearch=www.manboo.co.jp', '', '');
}
}