function btnSetClass(oBtn, sClassMode) {
	var oFx = oBtn.childNodes[0];
	
	switch ( sClassMode ) {
		case 'normal' :
			oFx.className = '';
		break;
		case 'over' :
			oFx.className = 'over';
		break;
		case 'down' :
			oFx.className = 'down';
		break;
	}
}