function fillCategory(){ 
 // this function is used to fill the category list on load
addOption(document.drop_list.Category, "1", "Heritage, Culture and Sport","");
addOption(document.drop_list.Category, "2", "Shopping", "");
addOption(document.drop_list.Category, "3", "What's On?", "");
addOption(document.drop_list.Category, "4", "Where to eat?", "");
addOption(document.drop_list.Category, "5", "Accommodation", "");

}

function SelectSubCat(){
// ON selection of category this function will work

removeAllOptions(document.drop_list.SubCat);

if(document.drop_list.Category.value == '1'){
addOption(document.drop_list.SubCat,"0", "All");
addOption(document.drop_list.SubCat,"7", "Animals & Nature");
addOption(document.drop_list.SubCat,"6", "Children's Activities");
addOption(document.drop_list.SubCat,"9", "Christian Heritage");
addOption(document.drop_list.SubCat,"10", "Culture and Leisure");
addOption(document.drop_list.SubCat,"1", "Heritage Sites");
addOption(document.drop_list.SubCat,"2", "Museums");
addOption(document.drop_list.SubCat,"3", "Parks & Gardens");
addOption(document.drop_list.SubCat,"5", "Sports");
addOption(document.drop_list.SubCat,"4", "Visitor Centre");
}
if(document.drop_list.Category.value == '2'){
addOption(document.drop_list.SubCat,"0", "All");
addOption(document.drop_list.SubCat,"Bookmakers", "Bookmakers", "");
addOption(document.drop_list.SubCat,"Cafe", "Cafe");
addOption(document.drop_list.SubCat,"Charity Shop", "Charity Shop", "");
addOption(document.drop_list.SubCat,"Electrical Goods", "Electrical Goods");
addOption(document.drop_list.SubCat,"Fashion", "Fashion", "");
addOption(document.drop_list.SubCat,"Garden Centre", "Garden Centre");
addOption(document.drop_list.SubCat,"Gifts", "Gifts");
addOption(document.drop_list.SubCat,"Hairdresser", "Hairdresser");
addOption(document.drop_list.SubCat,"Jewellery", "Jewellery");
addOption(document.drop_list.SubCat,"Off License", "Off License");
addOption(document.drop_list.SubCat,"Optician", "Optician");
addOption(document.drop_list.SubCat,"Pharmacy", "Pharmacy");
addOption(document.drop_list.SubCat,"Photo Developing", "Photo Developing");
addOption(document.drop_list.SubCat,"Supermarket", "Supermarket", "");
addOption(document.drop_list.SubCat,"Toy Shop", "Toy Shop", "");
addOption(document.drop_list.SubCat,"Travel Agent", "Travel Agent");
}
if(document.drop_list.Category.value == '3'){
addOption(document.drop_list.SubCat,"0", "All");
addOption(document.drop_list.SubCat,"3", "Arts/Crafts");
addOption(document.drop_list.SubCat,"1", "Children");
addOption(document.drop_list.SubCat,"20", "Christmas");
addOption(document.drop_list.SubCat,"17", "Church Service");
addOption(document.drop_list.SubCat,"4", "Dance");
addOption(document.drop_list.SubCat,"18", "Elgar");
addOption(document.drop_list.SubCat,"5", "Exhibition");
addOption(document.drop_list.SubCat,"15", "Festival");
addOption(document.drop_list.SubCat,"21", "Film");
addOption(document.drop_list.SubCat,"6", "Flowers/Gardens");
addOption(document.drop_list.SubCat,"12", "Food/Drink");
addOption(document.drop_list.SubCat,"13", "Historic");
addOption(document.drop_list.SubCat,"8", "Lecture/Talk");
addOption(document.drop_list.SubCat,"9", "Market");
addOption(document.drop_list.SubCat,"16", "Motoring");
addOption(document.drop_list.SubCat,"2", "Music");
addOption(document.drop_list.SubCat,"14", "Re-inactment");
addOption(document.drop_list.SubCat,"19", "River");
addOption(document.drop_list.SubCat,"11", "Sport");
addOption(document.drop_list.SubCat,"10", "Theatre/Drama");
addOption(document.drop_list.SubCat,"7", "Walk");
}
if(document.drop_list.Category.value == '4'){
addOption(document.drop_list.SubCat,"0", "All");
addOption(document.drop_list.SubCat,"2", "Cafe & Coffee Houses");
addOption(document.drop_list.SubCat,"4", "Fast Food");
addOption(document.drop_list.SubCat,"5", "Meal Stops");
addOption(document.drop_list.SubCat,"3", "Pubs & Bars");
addOption(document.drop_list.SubCat,"1", "Restaurants");
}
if(document.drop_list.Category.value == '5'){
addOption(document.drop_list.SubCat,"0", "All");
addOption(document.drop_list.SubCat,"Guest House", "Guest House and B&B");
addOption(document.drop_list.SubCat,"Hotel", "Hotel");
addOption(document.drop_list.SubCat,"Self Catering", "Self Catering");
}
}
////////////////// 

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);
}