Ok, the Problem is a bit confusing. If there is set a float attribute the Element gets hidden after Effect.appear. example: <a href="#" onclick="new Effect.appear(''demo'')">Click</a> <div style="display: none; float:left;"> Appear! </div> If you need a float a solution is shown at the wiki. Another Problem/Bug in Safari: If you set a class attribute and a style attribute, the class attribute will be ignored! Example: <div class="example" style="float:none"> Example </div> I saw this problem/bug while i was playing around with the demo Page in the Wiki to fix the above problem. See you! Sebastian PS.: I''m actually in vienna, so if someone of you want to meet me, you will find my telephone number at http://www.validcode.at/contact!