function swap(x,y) {
	document.getElementById('m'+x).src = eval(y + ".src");
	if( y == "mo" )
		document.getElementById('n'+x).style.textDecoration = "underline";
	else
		document.getElementById('n'+x).style.textDecoration = "";
}

ma = new Image(); ma.src = "graphics/ma.gif";
mo = new Image(); mo.src = "graphics/mo.gif";