(function($){$.fn.extend({elastic:function(){var mimics=['paddingTop','paddingRight','paddingBottom','paddingLeft','fontSize','lineHeight','fontFamily','width','fontWeight'];return this.each(function(){if(this.type!='textarea'){return false;}
var $textarea=$(this),$twin=$('<div />').css({'position':'absolute','display':'none'}),lineHeight=parseInt($textarea.css('lineHeight'),10)||parseInt($textarea.css('fontSize'),'10'),minheight=parseInt($textarea.css('height'),10)||lineHeight*3,maxheight=parseInt($textarea.css('max-height'),10)||Number.MAX_VALUE,goalheight=0,i=0;$twin.appendTo($textarea.parent());var i=mimics.length;while(i--){$twin.css(mimics[i].toString(),$textarea.css(mimics[i].toString()));}
function setHeightAndOverflow(height,overflow){curratedHeight=Math.floor(parseInt(height,10));if($textarea.height()!=curratedHeight){$textarea.css({'height':curratedHeight+'px','overflow':overflow});}}
function update(){var textareaContent=$textarea.val().replace(/<|>/g,' ').replace(/\n/g,'<br />').replace(/&/g,"&amp;");var twinContent=$twin.html();if(textareaContent+'&nbsp;'!=twinContent){$twin.html(textareaContent+'&nbsp;');if(Math.abs($twin.height()+lineHeight-$textarea.height())>3){var goalheight=$twin.height()+lineHeight;if(goalheight>=maxheight){setHeightAndOverflow(maxheight,'auto');}else if(goalheight<=minheight){setHeightAndOverflow(minheight,'hidden');}else{setHeightAndOverflow(goalheight,'hidden');}}}}
$textarea.css({'overflow':'hidden'}).bind('focus',function(){self.periodicalUpdater=window.setInterval(function(){update();},50);}).bind('blur',function(){clearInterval(self.periodicalUpdater);});update();});}});})(jQuery);