var siteurl  = "http://www.katahane.com";
var sitename = "『カタハネ』 website";
var imagename = "./images/katahane_top02.jpg";

if(navigator.userAgent.indexOf("MSIE") > -1){ //Internet Explorer
document.write('<!-'+'-[if IE]>');
document.write('<input type="image" src="',imagename,'"');
document.write(' onclick="window.external.AddFavorite(\'',siteurl,'\',\'',sitename,'\')">');
document.write('<![endif]-'+'->');
}

else if(navigator.userAgent.indexOf("Firefox") > -1){ //Firefox
document.write('<input type="image" src="',imagename,'"');
document.write(' onclick="window.sidebar.addPanel(\'',sitename,'\',\'',siteurl,'\',\'\');">');
}

else if(navigator.userAgent.indexOf("Opera") > -1){ //Opera
document.write('<a href="',siteurl,'" rel="sidebar" title="',sitename,'"><img src="',imagename,'" width="55" height="20" alt="カタハネ_オフィシャルページをお気に入りに登録"></a>');
}

else { //該当なし
void(0); //何もしない
}