function changeM(id) {

	var oM_l = document.getElementById('M_l' + id);
	var oM = document.getElementById('M_' + id);
	var oM_r = document.getElementById('M_r' + id);

	oM_l.style.backgroundPosition = 'right';
	oM.style.backgroundPosition = 'bottom';
	oM_r.style.backgroundPosition = 'right';
}

function changeM2(id) {

	var oM_l = document.getElementById('M_l' + id);
	var oM = document.getElementById('M_' + id);
	var oM_r = document.getElementById('M_r' + id);

	oM_l.style.backgroundPosition = 'left';
	oM.style.backgroundPosition = 'top';
	oM_r.style.backgroundPosition = 'left';

}

function changeText(nr, id) {
	
	var t = document.getElementById(id);
	t.style.fontSize = nr + "px";

}