function _volume_preload ()
{
	m1_off=new Image();
	m1_off.src = "des/btn1.gif";
	m1_on=new Image();
	m1_on.src = "des/btn1s.gif";
	m2_off=new Image();
	m2_off.src = "des/btn2.gif";
	m2_on=new Image();
	m2_on.src = "des/btn2s.gif";
	m3_off=new Image();
	m3_off.src = "des/btn3.gif";
	m3_on=new Image();
	m3_on.src = "des/btn3s.gif";
	m4_off=new Image();
	m4_off.src = "des/btn4.gif";
	m4_on=new Image();
	m4_on.src = "des/btn4s.gif";
	m5_off=new Image();
	m5_off.src = "des/btn5.gif";
	m5_on=new Image();
	m5_on.src = "des/btn5s.gif";
	m6_off=new Image();
	m6_off.src = "des/btn6.gif";
	m6_on=new Image();
	m6_on.src = "des/btn6s.gif";
}

function chimg(img_id, state)
{
	if (state==1)
	{
		if (document.all) { eval ('document["' + img_id + '"].src = ' + img_id + '_on.src;'); }
		else { eval ('document.images["' + img_id + '"].src = ' + img_id + '_on.src;'); }
	}
	else
	{
		if (document.all) { eval ('document["' + img_id + '"].src = ' + img_id + '_off.src;'); }
		else { eval ('document.images["' + img_id + '"].src = ' + img_id + '_off.src;'); }
	}
}

_volume_preload ();