var divhei = 149;
	var speed = 100;
	var y = 149;
	var box;
	
	function aendern() {
		box = document.getElementById('tbox');
		if(y == divhei) {
			box.style.display = 'block';
			box.style.overflow = 'hidden';
			auf();
		} else zu();
	}
	
	function auf() {
		if(y < end_y) {
			y += 10;
			box.style.height = y+'px';
			var zeit = window.setTimeout('auf()', speed);
		} else window.clearTimeout(zeit);
	}
	
	function zu() {
		if(y > divhei) {
			y -= 10;
			box.style.height = y+'px';
			if(y == 0) box.style.display = 'none';
			var zeit = window.setTimeout('zu()', speed);
		} else window.clearTimeout(zeit);
	}