function fillRegion(){ 
 // this function is used to fill the Region list on load
addOption(document.drop_list.Region, "North America", "North America", "");
addOption(document.drop_list.Region, "South America", "South America", "");
addOption(document.drop_list.Region, "Europe", "Europe", "");
addOption(document.drop_list.Region, "Middle East", "Middle East", "");
addOption(document.drop_list.Region, "Africa", "Africa", "");
addOption(document.drop_list.Region, "Russia", "Russia", "");
addOption(document.drop_list.Region, "Far East", "Far East", "");
}

function SelectSubRegion(){
// ON selection of Region this function will work

removeANYOptions(document.drop_list.SubRegion);
addOption(document.drop_list.SubRegion, "", "ANY", "");

if(document.drop_list.Region.value == 'ANY'){
addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
if(document.drop_list.Region.value == 'North America'){
addOption(document.drop_list.SubRegion,"Alaska", "Alaska");
addOption(document.drop_list.SubRegion,"Gulf of Mexico", "Gulf of Mexico");
addOption(document.drop_list.SubRegion,"Onshore US", "Onshore US");
addOption(document.drop_list.SubRegion,"Western Canada", "Western Canada");
addOption(document.drop_list.SubRegion,"Eastern Canada", "Eastern Canada");
addOption(document.drop_list.SubRegion,"Mexico", "Mexico");
//addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
if(document.drop_list.Region.value == 'South America'){
addOption(document.drop_list.SubRegion,"Venezuela", "Venezuela");
addOption(document.drop_list.SubRegion,"Argentina", "Argentina");
addOption(document.drop_list.SubRegion,"Brazil", "Brazil", "");
addOption(document.drop_list.SubRegion,"Other", "Other", "");
//addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
if(document.drop_list.Region.value == 'Europe'){
addOption(document.drop_list.SubRegion,"North Sea", "North Sea");
addOption(document.drop_list.SubRegion,"Other", "Other");
//addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
if(document.drop_list.Region.value == 'Middle East'){
addOption(document.drop_list.SubRegion,"North Africa", "North Africa");
addOption(document.drop_list.SubRegion,"Arabian Peninsula", "Arabian Peninsula");
addOption(document.drop_list.SubRegion,"Other", "Other");
//addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
if(document.drop_list.Region.value == 'Africa'){
addOption(document.drop_list.SubRegion,"Offshore West Africa", "Offshore West Africa");
addOption(document.drop_list.SubRegion,"Other", "Other");
//addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
if(document.drop_list.Region.value == 'Russia'){
addOption(document.drop_list.SubRegion,"Western Russia", "Western Russia");
addOption(document.drop_list.SubRegion,"Siberia", "Siberia");
addOption(document.drop_list.SubRegion,"CIS", "CIS");
addOption(document.drop_list.SubRegion,"Other", "Other");
//addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
if(document.drop_list.Region.value == 'Far East'){
addOption(document.drop_list.SubRegion,"China", "China");
addOption(document.drop_list.SubRegion,"Indonesia", "Indonesia");
addOption(document.drop_list.SubRegion,"Malaysia", "Malaysia");
addOption(document.drop_list.SubRegion,"Australia", "Australia");
addOption(document.drop_list.SubRegion,"India", "India");
addOption(document.drop_list.SubRegion,"Other", "Other");
//addOption(document.drop_list.SubRegion,"ANY", "ANY");
}
}
////// 

function removeANYOptions(selectbox)
{
	var i;
	for(i=selectbox.options.length-1;i>=0;i--)
	{
		//selectbox.options.remove(i);
		selectbox.remove(i);
	}
}


function addOption(selectbox, value, text, selected )
{
	var optn = document.createElement("OPTION");
	optn.text = text;
	optn.value = value;

	selectbox.options.add(optn);
}