Stop talking, show some examples:

WRONG

<a href="#" onClick="$('entry-form').toggle(); return false;">Post a new entry</a>
	    

COOL

<a href="#" id="show-form">Post a new entry</a>

$('show-form').addEvent('click', function(e){
  e = Event(e).stop();

  $('entry-form').toggle();
});