var bg_sound_on=true;  // bool, legt fest, ob ueberhaupt Sound gespielt werden soll
var bg_sound_track=0;  // int, legt fest, welcher Sound gespielt wird

/**
 * schaltet sound an/aus.
 * \parameter sollwert	boolean
 */
function sound_on_off(sollwert) {
	bg_sound_on = sollwert;
	if (bg_sound_on) {
		var iframe = document.getElementById('bg_sound') ? document.getElementById('bg_sound') : parent.document.getElementById('bg_sound');
		if (iframe) {
			/* wenn kein track explizit gegeben nimm den ersten */
			if (bg_sound_track===0) bg_sound_track=5;
			iframe.src = "sound/sound_"+bg_sound_track+".html";
		}
	} else {
		var iframe = document.getElementById('bg_sound') ? document.getElementById('bg_sound') : parent.document.getElementById('bg_sound');
		if (iframe) {
			iframe.src = "sound/sound_0.html";
		}
	}
}

/**
 * waehlt zu spielenden sound aus
 * \param sound_id	int, nummer des zu spielenden sounds
 */
function hg_sound(sound_id_) {
/*	
	var sound_id = sound_id_;
	var pano = document.pkform.panoid.value; // use pk-form
	var snd = getSoundForPano(pano);
	if (snd != -1)
	  sound_id = snd;
	if ((bg_sound_track != sound_id) && bg_sound_on){
		var iframe = document.getElementById('bg_sound') ? document.getElementById('bg_sound') : parent.document.getElementById('bg_sound');
		if (iframe) {
			iframe.src = "sound/sound_"+bg_sound_track+".html";
		}
	}
	bg_sound_track = sound_id;
*/
}