if (document.images) {	
	a_on = "img/img_02on.gif";
	a_off = "img/img_02.gif";
	b_on = "img/img_05on.gif";
	b_off = "img/img_05.gif";
	c_on = "img/img_06on.gif";
	c_off = "img/img_06.gif";
}

function mOver(name,p_on) {	
	if (document.images)
		document.images[name].src = p_on;
}

function mOut(name,p_off) {	
	if (document.images)
		document.images[name].src = p_off;
}