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

function SelectSubCat_powpanel(){
// ON selection of Panels this function will work

removeAllOptions(document.drop_list_powpanel.SubCat_powpanel);
removeAllOptions(document.drop_list_powpanel.Tier3_powpanel);
addOption(document.drop_list_powpanel.SubCat_powpanel, "", "Make a Selection", "");

if(document.drop_list_powpanel.Panels.value == 'standalone'){
addOption(document.drop_list_powpanel.SubCat_powpanel,"ftaCorded", "15A Corded");
addOption(document.drop_list_powpanel.SubCat_powpanel,"twaCorded", "20A Corded");
addOption(document.drop_list_powpanel.SubCat_powpanel,"ftaHard", "15A Hardwired");
}
if(document.drop_list_powpanel.Panels.value == 'remotecontrol'){
addOption(document.drop_list_powpanel.SubCat_powpanel,"ftaCorded2", "15A Corded");
addOption(document.drop_list_powpanel.SubCat_powpanel,"ftaHard2", "15A Hardwired");
}
if(document.drop_list_powpanel.Panels.value == 'sequencing'){
addOption(document.drop_list_powpanel.SubCat_powpanel,"ftaCorded3", "15A Corded");
addOption(document.drop_list_powpanel.SubCat_powpanel,"twaCorded3", "20A Corded");
addOption(document.drop_list_powpanel.SubCat_powpanel,"lowVolt3", "Low Voltage");
}
}
////////////////// 
function SelectTier3_powpanel(){
removeAllOptions(document.drop_list_powpanel.Tier3_powpanel);
addOption(document.drop_list_powpanel.Tier3_powpanel, "", "Make a Selection", "");

if(document.drop_list_powpanel.SubCat_powpanel.value == 'ftaCorded'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"Standard", "Standard");
addOption(document.drop_list_powpanel.Tier3_powpanel,"AdvancedSurge", "Advanced Surge Suppression");
addOption(document.drop_list_powpanel.Tier3_powpanel,"VoltProt", "Adv. S. S. \& O/U Voltage Protection");
addOption(document.drop_list_powpanel.Tier3_powpanel,"Lighted", "Lighted");
}
if(document.drop_list_powpanel.SubCat_powpanel.value == 'twaCorded'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"Standard2", "Standard");
addOption(document.drop_list_powpanel.Tier3_powpanel,"AdvancedSurge2", "Advanced Surge Suppression");
addOption(document.drop_list_powpanel.Tier3_powpanel,"VoltProt2", "Adv. S. S. \& O/U Voltage Protection");
}
if(document.drop_list_powpanel.SubCat_powpanel.value == 'ftaHard'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"Standard3", "Standard");
addOption(document.drop_list_powpanel.Tier3_powpanel,"Surge3", "Surge Suppression");
}
if(document.drop_list_powpanel.SubCat_powpanel.value == 'ftaCorded2'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"Standard4", "Standard");
addOption(document.drop_list_powpanel.Tier3_powpanel,"AdvancedSurge4", "Advanced Surge Suppression");
addOption(document.drop_list_powpanel.Tier3_powpanel,"AdvancedSurge4a", "Advanced Surge Suppression"); 
}
if(document.drop_list_powpanel.SubCat_powpanel.value == 'ftaHard2'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"Standard5", "Standard");
}

if(document.drop_list_powpanel.SubCat_powpanel.value == 'ftaCorded3'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"Standard6", "Standard");
addOption(document.drop_list_powpanel.Tier3_powpanel,"AdvancedSurge6", "Advanced Surge Suppression");
}
if(document.drop_list_powpanel.SubCat_powpanel.value == 'twaCorded3'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"Standard7", "Standard");
addOption(document.drop_list_powpanel.Tier3_powpanel,"AdvancedSurge7", "Advanced Surge Suppression");
}
if(document.drop_list_powpanel.SubCat_powpanel.value == 'lowVolt3'){
addOption(document.drop_list_powpanel.Tier3_powpanel,"fourstep", "4-Step");
addOption(document.drop_list_powpanel.Tier3_powpanel,"eightstep", "8-Step");
}

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


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