function fillCategory(){ 
 // this function is used to fill the category list on load
addOption(document.frm_booking.np, "HAL", "HAL Airport Road - Apartments", "");
addOption(document.frm_booking.np, "KOR", "Kormangala Apartments", "");
addOption(document.frm_booking.np, "BSK", "Banashankari Apartments", "");
}

function SelectNp(){
// ON selection of category this function will work
removeAllOptions(document.frm_booking.rt);
if(document.frm_booking.np.value == 'HAL'){
addOption(document.frm_booking.rt,"", "select");
//addOption(document.frm_booking.rt,"1b", "One Bed Room");
//addOption(document.frm_booking.rt,"2b", "Two Bed Room");
//addOption(document.frm_booking.rt,"3b", "Three Bed Room");
addOption(document.frm_booking.rt,"RER", "Regular Executive Room");
addOption(document.frm_booking.rt,"LER", "Luxury Executive Room");
addOption(document.frm_booking.rt,"RS", "Regular Studio Apartment");
addOption(document.frm_booking.rt,"LS", "Luxury Studio Apartment");
addOption(document.frm_booking.rt,"R2BHK", "Regular 2BHK Apartment");
addOption(document.frm_booking.rt,"L2BHK", "Luxury 2BHK Apartment");
addOption(document.frm_booking.rt,"R3BHK", "Regular 3BHK Apartment");
addOption(document.frm_booking.rt,"L3BHK", "Luxury 3BHK Apartment");
}
if(document.frm_booking.np.value == 'KOR'){
addOption(document.frm_booking.rt,"", "select");
//addOption(document.frm_booking.rt,"non", "Non A/c Regular");
//addOption(document.frm_booking.rt,"ac", "A/c");
addOption(document.frm_booking.rt,"LER", "Luxury Executive Room");
addOption(document.frm_booking.rt,"LS", "Luxury Studio Apartment");
addOption(document.frm_booking.rt,"L2BHK", "Luxury 2BHK Apartment");
}
if(document.frm_booking.np.value == 'BSK'){
//addOption(document.frm_booking.rt,"", "select");
//addOption(document.frm_booking.rt,"2br", "2 Bed Room Luxury");
//addOption(document.frm_booking.rt,"s", "Single Room");
addOption(document.frm_booking.rt,"RER", "Executive A/c Room");
addOption(document.frm_booking.rt,"RTPH", "Roof Top Party Hall");
}
}

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);
}