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


function expand_options(div_name) {
	div_control(div_name, true);
	div_control(div_name + 'Expand', false);
}


function collapse_options(div_name) {
	div_control(div_name, false);
	div_control(div_name + 'Expand', true);
}