Prototype javascript thingy to autofocus on search element on typing (ignoring navigational keys) and setting the search box as the first tab index

search_autofocus.js

Event.observe(window,'load',function() {
	$('search').tabIndex = 1;
	$(document).observe('keyup', function(e) {
		var navKeys = new Array(Event.KEY_BACKSPACE,Event.KEY_TAB,Event.KEY_RETURN,Event.KEY_ESC,Event.KEY_LEFT,Event.KEY_UP,Event.KEY_RIGHT,Event.KEY_DOWN,Event.KEY_DELETE,Event.KEY_HOME,Event.KEY_END,Event.KEY_PAGEUP,Event.KEY_PAGEDOWN,Event.KEY_INSERT);
		if(Event.element(e) == document.body) {
			if(navKeys.indexOf(e.keyCode)==-1){
				$('search').focus();
				$('search').value = String.fromCharCode(e.keyCode).toLowerCase();
			}
		}
	});
});