function fillVolume(){ 
 // this function is used to fill the Volume list on load first is value, second is text 
addOption(document.drop_list_audVolume.Volume, "Floor", "Floor Racks", "");
addOption(document.drop_list_audVolume.Volume, "Seismic-certified", "Seismic-Certified RacksTM", "");
addOption(document.drop_list_audVolume.Volume, "Vari-Rack", "Vari-Rack", "");
addOption(document.drop_list_audVolume.Volume, "Portable", "Portable Racks", "");
addOption(document.drop_list_audVolume.Volume, "Wall-Mount", "Wall-Mount Racks & Shelves", "");
addOption(document.drop_list_audVolume.Volume, "Pull", "Pull & Turn Racks", "");
addOption(document.drop_list_audVolume.Volume, "Credenza", "Credenza Racks", "");
addOption(document.drop_list_audVolume.Volume, "Laminated", "Laminated Racks", "");
}

function SelectSubCat_audVolume(){
// ON selection of loads this function will work

removeAllOptions(document.drop_list_audVolume.SubCat_audVolume);
removeAllOptions(document.drop_list_audVolume.Tier3_audVolume);
addOption(document.drop_list_audVolume.SubCat_audVolume, "", "Make a Selection", "");

if(document.drop_list_audVolume.Volume.value == 'audio1T27'){
addOption(document.drop_list_audVolume.SubCat_audVolume,	"audio2T86","70/25V 1-gang");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T87"	,"	70/25V 1-gang Decora\u00AE	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T88"	,"		70/25V 2-gang");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T89"	,"	70/25V 2-gang Decora\u00AE	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T90"	,"	10K ohm 1-gang Decora\u00AE	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T91"	,"	5K ohm 1-gang	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T92"	,"	50 ohm 1-gang	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T93"	,"	1500 ohm L-pad 1-gang	");
}
if(document.drop_list_audVolume.Volume.value == 'audio1T28'){
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T94"	,"	70/25V 1-gang Decora\u00AE");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T95"	,"	Adapter Plate");
}
if(document.drop_list_audVolume.Volume.value == 'audio1T29'){
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T96"	,"	8 ohm 1-gang	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T97"	,"	8 ohm 1-gang Decora\u00AE	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T98"	,"	70/25V 2-gang	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T99"	,"	70/25V 2-gang Decora\u00AE	");
}
if(document.drop_list_audVolume.Volume.value == 'audio1T30'){
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T100"	,"	70/25V	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T101"	,"	70/25V Decora\u00AE	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T102"	,"	10K ohm 	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T103"	,"	5K ohm");
addOption(document.drop_list_audVolume.SubCat_audVolume	,	"audio2T104"	,"	50 ohm	");

}
if(document.drop_list_audVolume.Volume.value == 'audio1T31'){
addOption(document.drop_list_audVolume.SubCat_audVolume	,"audio2T105","	70/25V 	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,"audio2T106","	70/25V Decora\u00AE	");
addOption(document.drop_list_audVolume.SubCat_audVolume	,"audio2T107","	8 ohm	");
}
if(document.drop_list_audVolume.Volume.value == 'audio1T32'){
addOption(document.drop_list_audVolume.SubCat_audVolume,"audio2T108", "Plain");
addOption(document.drop_list_audVolume.SubCat_audVolume,"audio2T109", "Pocket-ID\u00AE ");
addOption(document.drop_list_audVolume.SubCat_audVolume,"audio2T110", "Pocket-ID\u00AE  Decora\u00AE");
}
}
////////////////// 
function SelectTier3_audVolume(){
removeAllOptions(document.drop_list_audVolume.Tier3_audVolume);
addOption(document.drop_list_audVolume.Tier3_audVolume, "", "Make a Selection", "");


if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T86'){	
addOption(document.drop_list_audVolume.Tier3_audVolume	,"audio3T69","	Stainless Steel	");
addOption(document.drop_list_audVolume.Tier3_audVolume	,"audio3T70","	Plastic	");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T872'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T71","Plastic");
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T72","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T88'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T73","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T89'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T74","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T90'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T75","Plastic");
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T76","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T91'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T77","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T92'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T78","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T93'){
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T79","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T94'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T80","Plastic");
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T81","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T95'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T82","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T96'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T83","Stainless Steel");
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T84","Plastic");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T97'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T85","Plastic");
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T86","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T98'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T87","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T99'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T88","Stainless Steel");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T100'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T101'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T102'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T103'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T104'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T105'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T106'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T107'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T108'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T109'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T89","8-position ");
addOption(document.drop_list_audVolume.Tier3_audVolume,"audio3T90","8-position (installed volume controls)");
}
if(document.drop_list_audVolume.SubCat_audVolume.value == 'audio2T110'){	
addOption(document.drop_list_audVolume.Tier3_audVolume,"","No further options");
}


}
/////////////////

/////////////////
function removeAllOptions(selectbox)
{
	var i;
	for(i=selectbox.options.length-1;i>=0;i--)
	{
		//selectbox.options.remove(i);
		selectbox.remove(i);
	}
}


function addOption(selectbox, value, text )
{
	var optn = document.createElement("OPTION");
	optn.text = text;
	optn.value = value;

	selectbox.options.add(optn);
}