function show(Num){
	if (document.all){
		//IE;
		document.all[("div_" + Num)].className = "bt"+Num+"_on";
		return true;
	}
	if (document.getElementById){
		document.getElementById(("div_" + Num)).className = "bt"+Num+"_on";
		return true;
	}
	return true;
}

function hide(Num){
	if (document.all){
		//IE;
		document.all[("div_" + Num)].className = "bt"+Num+"_off";
		return true;
	}
	if (document.getElementById){
		document.getElementById(("div_" + Num)).className = "bt"+Num+"_off";
		return true;
	}
	return true;
}