$().ready(function(){
	$('a[rel]').each(function(){
		switch($(this).attr('rel'))
		{
			case 'external':
				this.title += (this.title ? ' ' : '') + 'Link goes to an external site.';
				break;
			case 'file':
				this.title += (this.title ? ' ' : '') + 'Link opens in a new window.';
				$(this).click(function(){
					window.open(this.href);
					return false;
				});
				break;
			default:
				break;
		}
	});
});