function addBookmark() {
  var IE = navigator.appName.match(/(Microsoft Internet Explorer)/gi);
  var NS = navigator.appName.match(/(Netscape)/gi);
  var OP = navigator.appName.match(/(Opera)/gi);
  var BK = document.getElementById('bookmark');
  BK.onmouseout = function(){
    window.status = '';
    return true;
  }
  if(IE && document.uniqueID){
    BK.onclick = function(){
        window.external.AddFavorite(location.href,document.title);    
    }
    BK.onmouseover = function(){
        window.status='Click to add this page to your '+RegExp.$1+' favorites';
        return true;
    }
  }

  else if(OP || IE && !document.uniqueID){
    BK.onclick = function(){
        alert('Your browser requires that you\nPress Ctrl & T to Bookmark this page.');
    }
    BK.onmouseover = function(){
        window.status='Your browser requires that you Press Ctrl & T to Bookmark this page.';
        return true;
    }
  }

  else if(NS){
    BK.onclick = function(){
        alert('Your '+RegExp.$1+' browser requires that you\nPress Ctrl & D to Bookmark this page.');
    }
    BK.onmouseover = function(){
        window.status='Your '+RegExp.$1+' browser requires that you press Ctrl & D to Bookmark this page.';
        return true;
    }
  }

  else{ BK.innerHTML = '' }
}