var obj;
var form;
var search_fields;

function fillSelect(host, obj, fk_value, form){

	if (fk_value != ""){
		this.search_fields = false;
		lockDropDowns(form);
	}
	
	this.obj = obj;
	this.form = form;
	
	resetSelect(obj);

	// check if object exisits.
	if(typeof obj != 'object') return false;

	if (obj.name == "state_id") {				
		resetSelect(form.region_id);
		url = host + '/location.php?country_id=' + fk_value;
		if (fk_value > 0) loadResult(url, '');		
	}

	if (obj.name == "region_id") {		
		url = host + '/location.php?state_id=' + fk_value;
		if (fk_value > 0) loadResult(url, '');		
	}
	

}



function fillSelectSearchPage(host, obj, fk_value, form){

	if (fk_value != ""){
		this.search_fields = true;
		lockDropDowns(form);
	}

	this.obj = obj;
	this.form = form;

	resetSelect(obj);

	// check if object exisits.
	if(typeof obj != 'object') return false;

	if (obj.name == "search_state") {
		resetSelect(form.search_region);
		url = host + '/location.php?searchpage=1&country_id=' + fk_value;
		if (fk_value > 0) loadResult(url, '');
	}

	if (obj.name == "search_region") {
		url = host + '/location.php?searchpage=1&state_id=' + fk_value;
		if (fk_value > 0) loadResult(url, '');
	}

}

function resetSelect(obj){
	while (obj.options.length>1) {
		deleteIndex=obj.options.length-1;
		obj.options[deleteIndex]=null;
	}
}

function loadXMLDoc(url) {
	// branch for native XMLHttpRequest object
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
		req.open("GET", url, true);
		req.send(null);
	// branch for IE/Windows ActiveX version
	} else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) {
			req.onreadystatechange = processReqChange;
			req.open("GET", url, true);
			req.send();
		}
	}
}

function processReqChange() {
	// only if req shows "complete"
	if (req.readyState == 4) {
		// only if "OK"
		if (req.status == 200) {
			// ...processing statements go here
			response  = req.responseXML.documentElement;
			if(response) {
				var result = new Array();
				for(i=0; i < response.getElementsByTagName('id').length; i++){
					//result[i] = {'id': response.getElementsByTagName('id')[i].firstChild.data, 'name': response.getElementsByTagName('name')[i].firstChild.data};
					result[i] = {'id': response.getElementsByTagName('id')[i].firstChild.data, 'name': response.getElementsByTagName('name')[i].firstChild.data, 'obj_name': response.getElementsByTagName('obj_name')[i].firstChild.data};
				}				
				loadResult('',result);
			}
		} else {
			alert("There was a problem retrieving the XML data:\n" + req.statusText);
		}
	}
}

function loadResult(url, result){	
	if (result != ''){
		// Response mode
		for(i=0; i < result.length; i++){
			//this.obj.options[obj.options.length]  = new Option(result[i].name,result[i].id);
			document.getElementById(result[i].obj_name).options[document.getElementById(result[i].obj_name).options.length]  = new Option(result[i].name,result[i].id);
		}
		unlockDropDowns(form);
	} else if(url != '') {
		// Input mode
		return (loadXMLDoc(url));
	}
}


function lockDropDowns(form){
	if (this.search_fields){
		form.search_country.disabled = true;
		form.search_state.disabled = true;
		form.search_region.disabled = true;
	}else{
		form.country_id.disabled = true;
		form.state_id.disabled = true;
		form.region_id.disabled = true;
	}
}

function unlockDropDowns(form){
	if (this.search_fields){
		form.search_country.disabled = false;
		form.search_state.disabled = false;
		form.search_region.disabled = false;
	}else{
		form.country_id.disabled = false;
		form.state_id.disabled = false;
		form.region_id.disabled = false;
	}
}