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

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

removeAllOptions(document.drop_list_audSoundmsk.SubCat_audSoundmsk);
removeAllOptions(document.drop_list_audSoundmsk.Tier3_audSoundmsk);
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk, "", "Make a Selection", "");

if(document.drop_list_audSoundmsk.Soundmsk.value == 'audio1T15'){
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk,"audio2T46","LT Music/Paging \& Masking");
}
if(document.drop_list_audSoundmsk.Soundmsk.value == 'audio1T16'){
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk	,	"audio2T47"	,"	SMTGM	");
}
if(document.drop_list_audSoundmsk.Soundmsk.value == 'audio1T17'){
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk	,	"audio2T48"	,"	SM-series	");
}
if(document.drop_list_audSoundmsk.Soundmsk.value == 'audio1T18'){
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk	,	"audio2T49"	,"	Generators	");
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk	,	"audio2T50"	,"	Generator/Amplifiers	");
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk	,	"audio2T51"	,"	Monitor Panels	");
addOption(document.drop_list_audSoundmsk.SubCat_audSoundmsk	,	"audio2T52"	,"	Impedance Matching Transformer	");
}
}
////////////////// 
function SelectTier3_audSoundmsk(){
removeAllOptions(document.drop_list_audSoundmsk.Tier3_audSoundmsk);
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk, "", "Make a Selection", "");


if(document.drop_list_audSoundmsk.SubCat_audSoundmsk.value == 'audio2T46'){	
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk	,"audio3T56","	0.8 cu ft / 2x2	");
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk	,"audio3T257","	0.8 cu ft / 1x2	");
}
if(document.drop_list_audSoundmsk.SubCat_audSoundmsk.value == 'audio2T47'){	
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk,"","No further options");
}
if(document.drop_list_audSoundmsk.SubCat_audSoundmsk.value == 'audio2T48'){	
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk,"audio3T58","0.4 cu ft");
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk,"audio3T59","0.15 cu ft");
}
if(document.drop_list_audSoundmsk.SubCat_audSoundmsk.value == 'audio2T49'){	
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk,"","No further options");
}
if(document.drop_list_audSoundmsk.SubCat_audSoundmsk.value == 'audio2T50'){	
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk,"","No further options");
}
if(document.drop_list_audSoundmsk.SubCat_audSoundmsk.value == 'audio2T51'){	
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk,"","No further options");
}
if(document.drop_list_audSoundmsk.SubCat_audSoundmsk.value == 'audio2T52'){	
addOption(document.drop_list_audSoundmsk.Tier3_audSoundmsk,"","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);
}