on(press){
   if ((System.capabilities.playerType=="ActiveX") || (System.capabilities.os=="MacOS")) { 
getURL("javascript:window.external.AddFavorite('http://www.tuwebswobs',' Templates');");
} else { // si no es IE win
getURL("javascript:alert('If you are using Mozilla Firefox, Please Pulse Ctrl+D  :)')");
}
}

 if (System.capabilities.playerType=="ActiveX" && System.capabilities.os=="MacOS")

var favoritez = "javascript:window.external.AddFavorite('http://www.myweb,'Titulo');"
on(press){
if algo-----qiue podria poner de condicion

   getURL(favorirez);

else

getURL("javascript:alert('If you are using Mozilla Firefox, Please Pulse Ctrl+D')");
}

<script language="JavaScript1.2" type="text/javascript">
function CreateBookmarkLink() { title = "Webpage Title";  
url = "Webpage URL";  
if (window.sidebar) { // Mozilla Firefox Bookmark
    window.sidebar.addPanel(title, url,"");    }
else if( window.external ) { // IE Favorite        
    window.external.AddFavorite( url, title); }    
else if(window.opera && window.print) { // Opera Hotlist        
    return true; }
}

if (window.external) {  
    document.write('<a href ="java script:CreateBookmarkLink()");">Add to Favorites</a>');   }
else  if (window.sidebar) {  
    document.write('<a href ="java script:CreateBookmarkLink()");">Bookmark Page</a>');  }
else if (window.opera && window.print) {      
    document.write('<a href ="java script:CreateBookmarkLink()");">Add Bookmark</a>');
    }
</script>

on (press){getURL("javascript:window.external.AddFavorite('http://www.myweb,'Titulo');");

window.sidebar.addPanel

on (press){getURL("javascript:window.sidebar.addPanel('http://www.myweb,'Titulo');");