if(navigator.userAgent.indexOf("MSIE") > -1){ //Internet Explorer
document.write('<!-'+'-[if IE]>');
document.write('<input type="button" value="お気に入りに追加"');
document.write(' onclick="window.external.AddFavorite(\'http://www.yorozugoto.com/service.html\',\'阪神間のお手軽な便利屋　よろず事.com\')">');
document.write('<![endif]-'+'->');
}

else if(navigator.userAgent.indexOf("Firefox") > -1){ //Firefox
document.write('<input type="button" value="ブックマークに追加"');
document.write(' onclick="window.sidebar.addPanel(\'阪神間のお手軽な便利屋　よろず事.com\',\'http://www.yorozugoto.com/service.html\',\'\');">');
}

else if(navigator.userAgent.indexOf("Opera") > -1){ //Opera
document.write('<a href="http://www.yorozugoto.com/service.html" rel="sidebar" title="阪神間のお手軽な便利屋　よろず事.com</a>');
}

else { //該当なし
void(0); //何もしない
}