var wkoko = 13;
function zoomFont(upp){
	var divi = document.getElementById('wrapper');
	if(upp == "up" && wkoko < 20){
		wkoko ++;
	}
	else if(upp == "down" && wkoko > 12){
		wkoko --;
	}
	divi.style.fontSize = wkoko + 'px';
}