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

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

removeAllOptions(document.drop_list_audElectronics.SubCat_audElectronics);
removeAllOptions(document.drop_list_audElectronics.Tier3_audElectronics);
addOption(document.drop_list_audElectronics.SubCat_audElectronics, "", "Make a Selection", "");

if(document.drop_list_audElectronics.Electronics.value == 'audio1T36'){
addOption(document.drop_list_audElectronics.SubCat_audElectronics	,"audio2T115","General Purpose Heavy Duty");
addOption(document.drop_list_audElectronics.SubCat_audElectronics	,	"audio2T116"	,"	Telephone	");
}
if(document.drop_list_audElectronics.Electronics.value == 'audio1T37'){
addOption(document.drop_list_audElectronics.SubCat_audElectronics	,	"audio2T117"	,"	Powered");
addOption(document.drop_list_audElectronics.SubCat_audElectronics	,	"audio2T118"	,"	Externally Powered");
}
if(document.drop_list_audElectronics.Electronics.value == 'audio1T38'){
addOption(document.drop_list_audElectronics.SubCat_audElectronics	,	"audio2T119"	,"	Utility Amplifier/Line Driver	");
}
if(document.drop_list_audElectronics.Electronics.value == 'audio1T39'){
addOption(document.drop_list_audElectronics.SubCat_audElectronics	,	""	,"	No further options	");
}
if(document.drop_list_audElectronics.Electronics.value == 'audio1T40'){
addOption(document.drop_list_audElectronics.SubCat_audElectronics	,"","	No further Options	");
}
}
////////////////// 
function SelectTier3_audElectronics(){
removeAllOptions(document.drop_list_audElectronics.Tier3_audElectronics);
addOption(document.drop_list_audElectronics.Tier3_audElectronics, "", "Make a Selection", "");


if(document.drop_list_audElectronics.SubCat_audElectronics.value == 'audio2T115'){	
addOption(document.drop_list_audElectronics.Tier3_audElectronics	,"","	No further options	");
}
if(document.drop_list_audElectronics.SubCat_audElectronics.value == 'audio2T116'){	
addOption(document.drop_list_audElectronics.Tier3_audElectronics,"audio3T97","blackdot");
}
if(document.drop_list_audElectronics.SubCat_audElectronics.value == 'audio2T117'){	
addOption(document.drop_list_audElectronics.Tier3_audElectronics	,"","	No further options	");
}
if(document.drop_list_audElectronics.SubCat_audElectronics.value == 'audio2T118'){	
addOption(document.drop_list_audElectronics.Tier3_audElectronics	,"","	No further options	");
}
if(document.drop_list_audElectronics.SubCat_audElectronics.value == 'audio2T119'){	
addOption(document.drop_list_audElectronics.Tier3_audElectronics	,"","	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);
}