function RollOff(img){
		if (document.images) window.document[img].src = eval(img + "_off.src");
}

function RollOn(img){
		if (document.images) window.document[img].src = eval(img + "_on.src");
}
	

speakers_on = new Image();
speakers_on.src = "/audio/essentials/images/btn_speaker_over.jpg";
speakers_off = new Image();
speakers_off.src = "/audio/essentials/images/btn_speaker.jpg";

power_on = new Image();
power_on.src = "/audio/essentials/images/btn_power_over.jpg";
power_off = new Image();
power_off.src = "/audio/essentials/images/btn_power.jpg";


audio_on = new Image();
audio_on.src = "/audio/essentials/images/btn_audio_over.jpg";
audio_off = new Image();
audio_off.src = "/audio/essentials/images/btn_audio.jpg";


amps_on = new Image();
amps_on.src = "/audio/essentials/images/btn_amplifier_over.jpg";
amps_off = new Image();
amps_off.src = "/audio/essentials/images/btn_amplifier.jpg";