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

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

removeAllOptions(document.drop_list_audMonitorpanel.SubCat_audMonitorpanel);
removeAllOptions(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel);
addOption(document.drop_list_audMonitorpanel.SubCat_audMonitorpanel, "", "Make a Selection", "");

if(document.drop_list_audMonitorpanel.Monitorpanel.value == 'audio1T33'){
addOption(document.drop_list_audMonitorpanel.SubCat_audMonitorpanel	,	""	,"	No further options	");
}
}
////////////////// 
function SelectTier3_audMonitorpanel(){
removeAllOptions(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel);
addOption(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel, "", "Make a Selection", "");

if(document.drop_list_audMonitorpanel.SubCat_audMonitorpanel.value == 'audio2T111'){	
addOption(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel,"audio3T91","Stainless Steel");
}
if(document.drop_list_audMonitorpanel.SubCat_audMonitorpanel.value == 'audio2T112'){	
addOption(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel,"audio3T92","Stainless Steel");
addOption(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel,"audio3T93","Plastic");
}
if(document.drop_list_audMonitorpanel.SubCat_audMonitorpanel.value == 'audio2T113'){	
addOption(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel,"audio3T94","Stainless Steel");
}
if(document.drop_list_audMonitorpanel.SubCat_audMonitorpanel.value == 'audio2T114'){	
addOption(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel,"audio3T95","Stainless Steel");
addOption(document.drop_list_audMonitorpanel.Tier3_audMonitorpanel,"audio3T96","Plastic");
}




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

/////////////////
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);
}