function on_sound()
{
	if(parent == null || parent.frames == null || parent.frames[0] == null || parent.frames[0].bsound == null) return;


	parent.frames[0].bsound = !parent.frames[0].bsound;

	if(parent.frames != null && parent.frames[0] != null && parent.frames[1] != null)
	{ 
		parent.frames[0].document.cookie = "snd_playing=" + (parent.frames[0].bsound ? "yes" : "no") + ";";
		parent.frames[1].open(parent.frames[0].bsound ? "sound.htm" : "silent.htm", "_self");
		
	}
}