tabfocus event plugin for jQuery

/**
 * tabfocus event plugin for jQuery
 * 
 * Mimics the focus() event, except it's only
 * called when focus wasn't assigned via a click
 * 
 * -------------------------------------------
 * Usage
 * -------------------------------------------
 * 
 * After including the plugin, you'll be able
 * to do this:
 * 
 * $('textarea').tabfocus(function(event){
 *     console.log('I was just tabbed into!');
 * });
 */

$.fn.tabfocus = function(fn){
	return this.each(function(){
		var $this = $(this),
			clicked = false;

		$this.mousedown(function(){
			clicked = true;
		});

		$this.focus(function(event){
			if (! clicked) {
				fn.call(this, event);
			} else {
				clicked = false;
			}
		});
	});
};