javascript - jQuery and CSS causing text to move oddly after animation -

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i have created fiddle scrolls box down , up, text "hide" , "show" move bit when animation has finished. have tried few different things cannot scroll correctly.

$('a#maintoggle').click(function(){     if ($('a#maintoggle').hasclass("down")) {         $('a#maintoggle').removeclass("down");         $('a#maintoggle').addclass("up");          $('#contentcollapse').stop(true, true).animate({height: '30px'},1000,function(){                 $('#contentcollapse').css("display", "none");                 $('a#maintoggle').addclass("hangdown");         });         $('a#maintoggle span').text("show");         $('#maintoggle em').html("<img src='img/show.gif' />");     } // end if     else{         $('#contentcollapse').css("display", "block");         curheight = $('#contentcollapse').height();         $('a#maintoggle').removeclass("hangdown");         autoheight = $('#contentcollapse').css('height', 'auto').height();         autoheight = autoheight + 15;         $('#contentcollapse').height(curheight).animate({height: autoheight}, 1000,function(){             $('a#maintoggle').addclass("down");             $('a#maintoggle').removeclass("up");             $('a#maintoggle span').text("hide");             $('#maintoggle em').html("<img src='img/hide.gif' />");         });     } // end else });


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