function buttonOn(which){
	if (document.all){ // IE
		which.style.backgroundColor = '#FFFFFF';
	}
	else if (document.layers){ //NS
		which.bgColor = '#FFFFFF';
	}
}

function buttonOff(which){
	if (document.all){ // IE
		which.style.backgroundColor = '#DDDDDD';
	}
	else if (document.layers){ //NS
		which.bgColor = '#DDDDDD';
	}
}