function changeSize(size) { 
	var text_inhalt = document.getElementById('text_inhalt');
	var text_rechts = document.getElementById('text_inhalt');
	switch (size) { 
		case '-2':
			text_inhalt.style.fontSize = '0.6em';
			text_rechts.style.fontSize = '0.6em';
			break;
			
		case '-1':
			text_inhalt.style.fontSize = '0.8em';
			text_rechts.style.fontSize = '0.8em';
			break;
			
		case '0':
			text_inhalt.style.fontSize = '1em';
			text_rechts.style.fontSize = '1em';
			break;
			
		case '1':
			text_inhalt.style.fontSize = '1.2em';
			text_rechts.style.fontSize = '1.2em';
			break;
			
		case '2':
			text_inhalt.style.fontSize = '1.4em';
			text_rechts.style.fontSize = '1.4em';
			break;
	}
}