function fillCategory(){ 
 // this function is used to fill the category list on load
addOption(document.drop_list.country, "Nepal", "Nepal", "");
addOption(document.drop_list.country, "India", "India", "");
addOption(document.drop_list.country, "Tibet", "Tibet", "");
addOption(document.drop_list.country, "Bhutan", "Bhutan", "");
}

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

removeAllOptions(document.drop_list.activities);
addOption(document.drop_list.activities, "", "Select any", "");

if(document.drop_list.country.value == 'Nepal'){
addOption(document.drop_list.activities,"Trekking in Nepal", "Trekking in Nepal");
addOption(document.drop_list.activities,"Tour in Nepal", "Tour in Nepal");
addOption(document.drop_list.activities,"Climbing in Nepal", "Climbing in Nepal");
addOption(document.drop_list.activities,"Expedition in Nepal", "Expedition in Nepal");
addOption(document.drop_list.activities,"Other activities", "Other activities");
}
if(document.drop_list.country.value == 'India'){
addOption(document.drop_list.activities,"Trekking in India", "Trekking in India");
addOption(document.drop_list.activities,"Tour in India", "Tour in India");
addOption(document.drop_list.activities,"Spiritual tour", "Spiritual tour", "");
addOption(document.drop_list.activities,"Adventure tour", "Adventure tour", "");
}
if(document.drop_list.country.value == 'Tibet'){
addOption(document.drop_list.activities,"Trekking in Tibet", "Trekking in Tibet");
addOption(document.drop_list.activities,"Tour in Tibet", "Tour in Tibet");
}
if(document.drop_list.country.value == 'Bhutan'){
addOption(document.drop_list.activities,"Tour in Bhutan", "Tour in Bhutan");
addOption(document.drop_list.activities,"Bhutan Trekking", "Bhutan Trekking");

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

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);
}