$(document).ready(function(){
   // Your code here
    $('textarea.antwort').autoResize({
	    // On resize:
	    onResize : function() {
	        //$(this).css({opacity:0.8});
	    },
	    // After resize:
	    animateCallback : function() {
	       // $(this).css({opacity:1});
	    },
	    // Quite slow animation:
	    // More extra space:
	    extraSpace : 20
	});
    
    $('textarea.antwort').css({'height' : '50px'});
 });