function divShow(div_id, visible) {
	// Standards-compliant browsers.
	if (document.getElementById) {
		var div_style = document.getElementById(div_id).style;
	// Old IE versions.
	} else if (document.all) {
		var div_style = document.all[div_id].style;
	// Netscape 4.
	} else if (document.layers) {
		var div_style = document.layers[div_id].style;
	// This browser can't handle layers.
	} else {
	    return;
	}
	div_style.display = (visible == false ? "none" : "block");
}

function readMoreShow(divGroup, visible) {
    divShow(divGroup + "a", visible);
    divShow(divGroup + "b", visible);
    divShow(divGroup + "c", !visible);
}