var ro_capable = false;
var ro_selected = 0;

function ro_getRef (which) {
	return eval('document.images[\'button_' + which + '\']');
}

function ro_switch (which, state) {
	if (!ro_capable) return;
	if (which == ro_selected) return;

	imgRef = ro_getRef(which);
	imgRef.src = imgArray[which][state].src;
}

function ro_reset () {
	ro_selected=0;
	for(i=0;i<imgArray.length;i++)
		if (ro_getRef(i))
			ro_switch(i,0);
}

function ro_set (which) {
	if (!ro_capable) return;

	ro_reset();
	imgRef = ro_getRef(which);
	imgRef.src = imgArray[which][1].src;
	ro_selected = which;
}